Merge pull request #12 from nezza/master

Better completion with dropdown on multiple possible completions.
Enable sandboxing
Add license and copyright owners, remove my file-level copyright notices, remove myself as organization to avoid any more
Handle idle event
Rename getSelectedBuffer to selectedBuffer
Refactor heartbeat

* move creating of method call to model
* rename selectedBuffer to selectedBufferId
ChatWindowController: Make selectedBuffer a property
MethodCall: Use read only property for methodName
Fix method calls by explicitly adding readonly methodName property to Mantle’s property set
Set line spacing to 2 points
Merge remote-tracking branch 'nezza/master'

Conflicts:
	Rainchat/MXIMessageTextField.h
	Rainchat/MXIMessageTextField.m
Merge remote-tracking branch 'upstream/master'
Fix compilation of MXIClientReconnectMethodCall and remove old MXIMessageTextField.h/m