Refactor the code

Add comments
Change variable name to a more descriptive name
Rearrange code into units
Fix the bug that prevents user from voting

This bug only allows user to vote the first requirement
Enhance the vote controller

The controller will change the red light to green when a requirement
is voted
Store the list of requirements in DefaultListModel
Add red and green icons
Create a customized cell renderer

Add an icon to every requirement in the JList of VotePanel
Merge branch 'dev-addIconBeforeRequirement' into dev

Conflicts:
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/view/session/VotePanel.java
Makes selected requirement a planning poker requirement instead of a string.