Add sleep in tests to prevent random failing when next test starts before ajax requests for old one in progress

* Render right layout depends on current_user
* show sample git username/email when repo is empty
* Show extra info when browsing public area
* Fixed some tests related to public projects
* show comments in read-only for public projects
* Remove old public routing

GITLAB-1279 (GITLAB-1264)

Change-Id: Ifb5b4313bc91fae720f8ef5c36152c45e9d38934

When viewing the diff for a changed image file, two bugs occur:

- Both the 'before' and 'after' images link to the 'after' commit
- Visiting the link for either image will cause a error

The first is caused by both image links referencing '@commit.id' rather
than '@commit.parent_id'.  The second is caused by the use of
'project_tree_path' which is used for creating links to directories in
the git file tree. 'project_blob_path' which links to files should be
used instead.

Previously, only number of changed files mattered. Now, number of lines to render in the diff are also taken into account.

A hard limit is set, above which diffs are not rendered and users are not allowed to override that. This prevents high server
resource usage with huge commits.

Related to #1745, #2259

In addition, handle large commits for MergeRequests and Compare controllers.

Also fixes a bug where diffs are loaded twice, if user goes directly to merge_requests/:id/diffs URL.

1. Replace params key 'q' with 'extended_sha1'. A extended SHA1 syntax is explained in 'man gitrevisions'.
2. Change the placeholder of looking for commit.
3. Change the label of ref filter.

-Form was for @source_project rather then @Project.
-add spinach test for edit submission on forked project

Change-Id: I807a5077608b7e910f4bc83c5d3e82c378f70a9e

-Some changes around calling origional methods for !for_fork? merge requests. Other changes to follow

Change-Id: I009c716ce2475b9efa3fd07aee9215fca7a1c150

-Had to do some minor test clean up as well

Change-Id: I8f378f1b5fe676d73b8691e870c11ca6def90cbf

-Removed many extra spaces I added
-Fixed email templates to be consistent/better looking

GITLAB-894, GITLAB-895, (GITLAB-858)

Change-Id: I35c1a8e0e22af7de26d54e5c3da987fa7bb3921e

Trying to retrigger travis
Change-Id: Ifd86fb4c6b2791ad176230254fbf69a9ade979fb

Wasn't setting fields so validations would fail

Change-Id: I0363c57bf6c8b9937cc1b4140d09071d7c5168c2