#74: added a flashBag to the Session object
#74: fixed session flashBag which is now initalizing in a lazy way
#74: simplified flashBag method names
#74: added session flashbag docs
#74: replaced occurences of missing function "exists"
added svg to the supported content-types
#74: added flashbag test
#74: removed unused method from flashbag test
Merge branch 'der-on-master' into session-flash
Rename 'FlashBag' simply to 'Flash'
Moved Flash into its own lib
Updated tests for Flash lib
Linting
Pull methods out of constructor into prototype object
JS idiom, added some fallbacks for message stringification
Make API more specific addMessage/getMessages
Tests for specific API
Use Rails API for Flash
Need original session-data to check for timed out session
Implement flash methods on the BaseController