Added NetworkService.java for http get and post requests. Implemented requestQuestions.
Removed main method and changed fields to public final.
Merge pull request #35 from kevinloh/master

Created NetworkService.java and implemented requestQuestions.

>> Reviewed for design and style (BKN)
style guidelines for CodePro
Merge pull request #36 from vkwagner/master

Style Guidelines for CodePro

>> Not reviewed. This is an auto-generated .pref file (BKN)
switched to use java.util.Date
WIP: fleshing out QuestionService
WIP: made NetworkService, QuestionService singletons. Added NetworkConstants class
added test project
WIP: adding QuestionServiceTest. Added Mockito