Version manager implementation; methods and tests
Content manager implementation; methods and tests
Content Manager implementation methods and tests.
Version Manager implementation methods and tests.
Merge remote-tracking branch 'upstream/master'
Creates common directives file

Instead of having separate directive files. Specific directive files
will go within their correponding section folder (e.g. dashboard)
Adds links to preview page in the item list widget
Dependency Manager
Implementation and tests
Workflow Manager
Implementation and tests
CRAFTERCMS-316: Click pencil icon to see edit panel at bottom of page
Merge remote-tracking branch 'david/master'