send button is now not enabled until after estimates have been selected, but it still enabled if you send all selected estimates and that becomes empty. klbrann
set sendEstimatesToReqButton to become disabled upon pressing so that once estimates are sent and that part of the tree is empty, the button is disabled again. klbrann
Merge pull request #191 from zoccihedron/fix-issue185

Fix issue185
Started implmentation of RemoveDeckController. Continued implementing
other classes related to deck manager. Added methods that allow the right
hand side of DeckManager to be cleared and/or display a message relating
to deck removal.
Merge branch 'dev-codonbleu' of github.com:zoccihedron/wpi-suite into feature-deckManager