Add sessions to Events and event payload members

By making Events subclass GitHubCore, it will be passed a session when
created. When that happens, any element of the payload that we convert
to a github3 object will also have the same session.

Fixes #303

github3/events.py

@@ -8,10 +8,10 @@ This module contains the class(es) related to Events
 """
 from __future__ import unicode_literals
-from .models import GitHubObject
-class Event(GitHubObject):
+from .models import GitHubCore
+class Event(GitHubCore):
     """The :class:`Event <Event>` object. It structures and handles the data
     returned by via the `Events <http://developer.github.com/v3/events>`_
@@ -47,7 +47,7 @@ class Event(GitHubObject):
         handler = _payload_handlers.get(self.type, identity)
         #: Dictionary with the payload. Payload structure is defined by type_.
         #  _type: http://developer.github.com/v3/events/types
-        self.payload = handler(event.get('payload'))
+        self.payload = handler(event.get('payload'), self)
         #: Return ``tuple(owner, repository_name)``
         self.repo = event.get('repo')
         if self.repo is not None:
@@ -64,101 +64,102 @@ class Event(GitHubObject):
         return sorted(_payload_handlers.keys())
-def _commitcomment(payload):
+def _commitcomment(payload, session):
     from .repos.comment import RepoComment
     if payload.get('comment'):
-        payload['comment'] = RepoComment(payload['comment'], None)
+        payload['comment'] = RepoComment(payload['comment'], session)
     return payload
-def _follow(payload):
+def _follow(payload, session):
     from .users import User
     if payload.get('target'):
-        payload['target'] = User(payload['target'], None)
+        payload['target'] = User(payload['target'], session)
     return payload
-def _forkev(payload):
+def _forkev(payload, session):
     from .repos import Repository
     if payload.get('forkee'):
-        payload['forkee'] = Repository(payload['forkee'], None)
+        payload['forkee'] = Repository(payload['forkee'], session)
     return payload
-def _gist(payload):
+def _gist(payload, session):
     from .gists import Gist
     if payload.get('gist'):
-        payload['gist'] = Gist(payload['gist'], None)
+        payload['gist'] = Gist(payload['gist'], session)
     return payload
-def _issuecomm(payload):
+def _issuecomm(payload, session):
     from .issues import Issue
     from .issues.comment import IssueComment
     if payload.get('issue'):
-        payload['issue'] = Issue(payload['issue'], None)
+        payload['issue'] = Issue(payload['issue'], session)
     if payload.get('comment'):
-        payload['comment'] = IssueComment(payload['comment'], None)
+        payload['comment'] = IssueComment(payload['comment'], session)
     return payload
-def _issueevent(payload):
+def _issueevent(payload, session):
     from .issues import Issue
     if payload.get('issue'):
-        payload['issue'] = Issue(payload['issue'], None)
+        payload['issue'] = Issue(payload['issue'], session)
     return payload
-def _member(payload):
+def _member(payload, session):
     from .users import User
     if payload.get('member'):
-        payload['member'] = User(payload['member'], None)
+        payload['member'] = User(payload['member'], session)
     return payload
-def _pullreqev(payload):
+def _pullreqev(payload, session):
     from .pulls import PullRequest
     if payload.get('pull_request'):
-        payload['pull_request'] = PullRequest(payload['pull_request'], None)
+        payload['pull_request'] = PullRequest(payload['pull_request'],
+                                              session)
     return payload
-def _pullreqcomm(payload):
+def _pullreqcomm(payload, session):
     from .pulls import PullRequest, ReviewComment
     # Transform the Pull Request attribute
     pull = payload.get('pull_request')
     if pull:
-        payload['pull_request'] = PullRequest(pull)
+        payload['pull_request'] = PullRequest(pull, session)
     # Transform the Comment attribute
     comment = payload.get('comment')
     if comment:
-        payload['comment'] = ReviewComment(comment, None)
+        payload['comment'] = ReviewComment(comment, session)
     return payload
-def _release(payload):
+def _release(payload, session):
     from .repos.release import Release
     release = payload.get('release')
     if release:
-        payload['release'] = Release(release)
+        payload['release'] = Release(release, session)
     return payload
-def _team(payload):
+def _team(payload, session):
     from .orgs import Team
     from .repos import Repository
     from .users import User
     if payload.get('team'):
-        payload['team'] = Team(payload['team'], None)
+        payload['team'] = Team(payload['team'], session)
     if payload.get('repo'):
-        payload['repo'] = Repository(payload['repo'], None)
+        payload['repo'] = Repository(payload['repo'], session)
     if payload.get('sender'):
-        payload['sender'] = User(payload['sender'], None)
+        payload['sender'] = User(payload['sender'], session)
     return payload
-def identity(x):
+def identity(x, session):
     return x
@@ -174,7 +175,7 @@ _payload_handlers = {
     'IssueCommentEvent': _issuecomm,
     'IssuesEvent': _issueevent,
     'MemberEvent': _member,
-    'PublicEvent': lambda x: '',
+    'PublicEvent': identity,
     'PullRequestEvent': _pullreqev,
     'PullRequestReviewCommentEvent': _pullreqcomm,
     'PushEvent': identity,