Finish rewriting Budget class and tests for now
Merge branch 'master' into fix-budget-interface

Conflicts:
	src/com/example/budgetmanager/api/ApiInterface.java
Add some comments and remove extraneous whitespace
Add comments to helper methods in the Budget test cases
Merge pull request #43 from coldstar96/fix-budget-interface

Rewrite of Budget class to use Joda Time