Some backend fixes
 Changes to fix problem with deleting events
Merge branch 'dev' of https://github.com/CS3733Team1/wpi-suite into dev
Created JUnit test case for Category class
Added setUp() method to Category test case
Cut and paste existing test methods from CommitmentTest into CategoryTest
Merge branch 'feature/Tests' into dev
Merge remote-tracking branch 'origin/dev' into feature/jtc_bug_fixes