Disabled the add/remove button as appropriate.

The add button is now disabled if there are no more requirements to select from.

The remove button is now disabled if there are no more requirements to remove from the game (such as at the start of creating a planning poker session.
Header:Added a Moderator String field to the PlanningPokerGame model. Also added a Serializer for it.

Reported-by: lhnguyenduc
Signed-off by: Long Nguyen Duc Hoang <lhnguyenduc@wpi.edu>
Add the database functionality for votes.

authors: rbkillea
Merge pull request #119 from hlong290494/sbl-dev

Moderator field for the PlanningPokerGame model
Merge pull request #118 from sfmailand/sbl-dev

Disabled the add/remove button as appropriate.
Merge pull request #120 from ryanbaylorkillea/sbl-dev

Add the database functionality for votes.
Adds an export button that outputs selected requirements to a file.
This file is created if it is non-existant.
This file is currently in wpi-suite/Janeway and named requirements.txt.

TODO: Allow the user to input their own file name
TODO: Move the button to a better place
TODO: Add transaction history and acceptance tests to the file output

Manually merge by Long Nguyen Duc Hoang <lhnguyenduc@wpi.edu>
Original codes by benkorza.
Merge pull request #121 from hlong290494/sbl-dev

Adds an export button that outputs selected requirements to a file.
Improve the extendability of SubmitPane.java by changing the buttons into array elements.

Reported-by: lhnguyendu
Signed-off by: Long Nguyen Duc <lhnguyenduc@wpi.edu>
Merge pull request #122 from hlong290494/cardButton

Change the card buttons into array elements
Add action listeners and parsing to button handling code.

CoAuthors: rbkillea, lhnguyenduc
Merge pull request #123 from cgwalker/sbl-dev

Add action listeners and parsing to button handling code.
Organizes all the imports for each class, Authors: swconley and labatbouta
Header: Make the team estimate data a Table.

Reported-by: lhnguyenduc, cgwaler, rbkillea
Merge pull request #126 from hlong290494/sbl-dev

Make the team estimate data panel a Table.
Merge pull request #125 from swconley/sbl-dev

Adds several WPI-Suite header comments where needed. Authors: swconley and labatbouta
Cleans up the imports for several files