Project import functionality

This is a MR for the import functionality of https://gitlab.com/gitlab-org/gitlab-ce/issues/3050, which adds the ability to import single projects.

Branched off https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3114

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Added 1 commit:

• 2cc6aaec - WIP (broken) - playing with import stuff

Title changed from WIP: Project import funcitonality to WIP: Project import functionality

Added 1 commit:

• f0ce83b1 - modify model creation to use services when they are available

Added 1 commit:

• 40de1b46 - revert back services changes

Added 1 commit:

• e90b1e14 - refactored project creation to create the associations as well

Added 3 commits:

• 2a7a1bcc - refactored methods in project tree restorer
• a7acfa66 - add project members to export
• af9b4823 - Merge branch 'feature/project-export' of gitlab.com:gitlab-org/gitlab-ce into feature/project-import

Added 1 commit:

• febff153 - started mapping members

Added 2 commits:

• cc8aafed - typo
• 3f479edd - Merge branch 'feature/project-export' of gitlab.com:gitlab-org/gitlab-ce into feature/project-import

Added 2 commits:

• 2fd30231 - fix project members export
• c2304141 - Merge branches 'feature/project-export' and 'feature/project-import' of gitlab.c…

Added 1 commit:

• b7149266 - WIP project members - json not quite right yet

Added 2 commits:

• eb2b9e3e - fix project members json to include user
• e45c2bf8 - Merge branches 'feature/project-export' and 'feature/project-import' of gitlab.c…

Added 1 commit:

• cbae4038 - updated test json

Added 1 commit:

• 7b855b75 - project members import stuff

Added 1 commit:

• 18d3b38e - project members: fixed a few issues. Specs now passing

Marked the task members as completed

Added 3 commits:

• 66d3f985 - add id to project member user json
• b92411a0 - Merge branch 'feature/project-export' of gitlab.com:gitlab-org/gitlab-ce into feature/project-import
• 1d8e02c4 - solved a bunch of issues with mapping members/users

Added 1 commit:

• 76efdea7 - fixing MR issues with import

Marked the task issues as completed

Added 1 commit:

• 3a131383 - fixed MR issue and refactored some stuff

Added 1 commit:

• 37c68fe0 - don't create MR diff as this can be imported presumably