added the HSL color adapter
Started implementing category manager UI

victorandreoni92 
ssawatzki
Merge branch 'dev' into category_manager
Improved function naming in CategoryModel, further developed category
manager, added category instance in MainPanel, added temporary button in
event tool bar group

victorandreoni92
Prettied up right category panel, more to do
Added border to right panel, added comments
Added text validation for category name field
Framework for updating/adding/deleting category
One-line change to save categories to database through manager
Merge branch 'category_manager' of github.com:cs3733-team4/wpi-suite into category_manager
added the color picker, but it's not nearly finalized, probably will change after meeting today. there is also a quick fix for the button header that was broken in this branch that will most likely conflict with the bug_fixes branch change, so use that one instead when a merge occurs. Also I was getting an error in VanGoghPainting that I will bring up at the meeting. there is also a work-around for that error in this commit
created singletons out of the event/category models, also added caching to the categories. made the categories stick the events, and all is looking good
merged and colors on day calendar now work
Added selection on category manager UI, which updates the text field
with the name of the selected category. Still work in progress.
Added various comments. Pushing only to pull new additions to branch.
Implemented updating categories 

Kept category manager from closing upon the addition of a new category,
routed calls to server manager through main panel, cleaned up UI change.

acfortier
Resized color picker, added UI padding, removed edit functionality.

Edit functionality was removed because it's a work in progress and is
not required for this week's iteration.

acfortier
Created default no category and cleaned code.

acfortier
Fixed no category notice not being removed bug.

acfortier
Prevent categories form having the same name.

Cleaned comments.