Add accessors to configs and projects using the menu item.

This allows usage such as:

genome analysis-project create --analysis-menu-items \
analysis_projects.id=12345

to copy all menu items to a new project.
Updated class browser cache.
Updated `genome` tab completion.
Use fake data for this test. (Except the reference...)
Merge pull request #220 from tmooney/add_menuitem_relations

Add accessors to configs and projects using the menu item.
Merge pull request #230 from tmooney/use_test_data

Use fake data for this test. (Except the reference...)