Removes old access tests for private projects.
Removes old access tests for public projects.
Removes old access tests for subprojects.
Removes old access tests for components and nested components.
Fixes existing add contributor tests and generalizes them to subprojects and components.
Removes old add contributor tests.
Removes some old access tests for components.
Adds docstrings to add contributor tests.
Merge branch 'develop' into f/access

Conflicts:
	project_access_tests.py
	tests/projects/test_add_contributor.py
Merges multiple contributor tests.
Fixes add contributor tests.
Adds access tests for added contributors.
Expands access tests for added contributors.
Merge branch 'develop' of https://github.com/CenterForOpenScience/osf-ui-tests into f/access2
Removes old project access tests.
Adds file access tests.
Removes old file access tests.
Adds unfinished tests forking with private nodes.
Merge pull request #72 from rliebz/f/access2

F/access2