Deprecate 'return false' in event handlers
Re-add  with warning and monitorCodeUse
Fixed style and comment nits
Test for both true and false
More info in monitorCodeUse call
Look on __reactBoundContext for displayName
Indentation for eventHandlerName
Removed monitorCodeUse call
Use warning module
Merge pull request #2039 from crm416/return-false

Deprecate 'return false' in event handlers