Cleanup of the DeckVotingPanel
Adds PlanningPoker build folder to ".gitignore"
Refreshes the voting page rather than resetting after a vote submission
Resolves null pointer exception on a non-deck vote submission
Correctly updates the submit button
Resets text voting to empty after a submission
Correctly updates the submission label and error labels
Cleanup of the votingPage class
Removes unused methods and unnecessary methods.
Removes unused field and method of PlanningPokerSession
Merge pull request #295 from TheTeam8s/voteSubmissionUpdate

Voting Sub-panel updates instead of resetting after a submission
Keeps the OverviewTreePanel expanded and re-factors some code
Merge pull request #299 from TheTeam8s/fix-keepOverviewTreeOpen

Keeps the OverviewTreePanel expanded and re-factors some code
refresh function in overviewTreePanel no longer throws a null pointer exception if a session does not have a creator name