Added getEventByCategory method
Added in functionality for testing

*Added addCategory method for Events
*Added in addName and addColor methods per Ted's model
*Adding in tests, currently stuck on error.
Merge branch 'dev' into add_by_category
Tested getEventByCategory, working
Implemented changing category on event after deletion
Made initial changes to suppor editing and deleting categories.
Merge branch 'add_by_category' of https://github.com/cs3733-team4/wpi-suite into add_by_category
Implemented deleting category from DB
Committing to merge with Alex and finish deleting
Merge branch 'add_by_category' of https://github.com/cs3733-team4/wpi-suite into add_by_category
Further improved back end of deleting and editing category. WIP.

Alex: Check that categories are deleted from database upon Janeway
closing
Added some testing for CategoryEntityManager, more TODO
Added more tests
Adapted color picker to support external selector movement

Used for editing categories.
Worked on edit category. See extended description

Still work in progress.

- Implemented auto movement of color picker to color of selected event
- Started implementation of checkers for constraining selection while
editing category
- Added cancel button and worked on UI
- Modularized population of category list to allow for proper update
upon addition, edition, or deletion.
- Tweaked validate method to allow editing events (WIP)
Implemented move cursor int selector method in color picker

Allos to move cursor to arbritary integer location
Further improved category manager. Read full description

* Finished moving constraints checkers with error message
* Removed unnecessary default no category

Still work in progress.
Added framework for testing, and some tests
Finalized most of category manager. Read full description.

* Updated category model delete to update cache
* Added mouse listeners to improve selection in manager
* Made UI layout consistent with rest of project
* Implemented proper refreshing upon addition, edition, and deletion
* Modularized some code
Merge branch 'add_by_category' of https://github.com/cs3733-team4/wpi-suite into add_by_category