Bug Fixes and Additions

Added:

-Cancel button in alert view pop up when disconnecting allowing the
user to cancel and return to the session.

Fixed the following bugs:

- Disconnect button disabled when a participant is forced to leave by
the creator deleting the session
- Fixed bug with currentLoc not being updated properly causing a user
to not be able to delete other users' text.
- Fixed bug with ResolveConflicts method that was reporting conflicts
when none were there.
- Added constraints to bottom toolbar so it expands to fill screen when
in landscape view.
- Fixed bug where a user's text could be deleted by another user making
any undo's for that text invalid, but the undo button still being
enabled for that action/text.