Using the requested session.
Don't prevent the modification of slider value if it is out of range.
page_session stylesheet removed. New select menu added to select a session.
Page Renaming, session token moved from cookie to url. CSS update to display the index' buttons correctly.
Add sinatra capture keys in the params array in requests. Add join request object.
Add JoinRequest.rb file for the previous commit. PlayRequest renamed into UpdateViewRequest.
Test if other_zones is defined.
ParseError exceptions added to parsing functions for user requests.
Rescue parse errors on user requests.
Merge session in board. The admin session is more simple, with only a session var. Warning: the allocator in board is not instanciated and join/leave/load_board functions should not work.
Add unique constraint for session_token.
Zone join and leave operations are saved by the board. Using the session in the url for update_data request. Join request rewritten to restore the user and his zone. Join_request fixes. Allocator is now instanciated for each board.join calls.
Added constraints for deleting sessions.
Added changelog.
Fix typo in the name of dm constraints module.
Merge branch 'feature/command-line-tool' into develop
Merge branch 'develop' into feature/multisession

Conflicts:
	poieticgen/board_snapshot.rb
	poieticgen/join_request.rb
Adding association between zone and user, and between event and user (and zone).
Merge branch 'feature/multisession' of project.gnuside.com:poietic-generator into feature/multisession
Fixing bug: strokes not saved.