Merge in @juliocesar's work

https://github.com/podio/jquery-mentions-input/pull/53
added documentation for the new onCaret
Merging in the error caught by  Raven24

https://github.com/podio/jquery-mentions-input/pull/44
Adding in the Triggers from johnfrederik

https://github.com/podio/jquery-mentions-input/pull/43
Merging in ryanramage's multiple triggerChar support

https://github.com/podio/jquery-mentions-input/pull/8
fixing some errors.
Adding a class to the mentionItemHighlight
Looks like we had some weirdness calling things trigger and triggerChar. Fixed.
Removing usage of jQuery.data which auchenberg doesn't want.

see:
https://github.com/podio/jquery-mentions-input/pull/7#issuecomment-36499
64
adding more test people.
TODO allow the plugin to copy the styles of the textarea
clean up
Adding more documentation. Also removing copyStyles.