Icon Redesign -category icon updated- changed default categories' colors to pastels
Merge branch 'dev' of https://github.com/CS3733Team1/wpi-suite into dev

# By A.J. Tamburri (3) and Rohit Bansal (1)
# Via Rohit Bansal
* 'dev' of https://github.com/CS3733Team1/wpi-suite:
  Tested another constructor.
  Cut and paste existing test methods from CommitmentTest into CategoryTest
  Added setUp() method to Category test case
  Created JUnit test case for Category class