[New Trigger] Cast Bar

Hello,
First of all, thank you for your addon. It's very usefull (and your code was pretty awesome, everything treated as objects that's great)).
I felt like there was a functionnality which was missing for me and my teammates. It's the ability to pop an aura when a boss/mob cast a certain spell. Aura mastery couldn't do it at this time so I have looked at your code and then implemented it.
I have done many testing and everythings is OK. You can checkout the changes in the github interface and test it in game :). I hope it's gonna feat with your plans, I'm pretty sure people may like it. For exemple on X-89 when the boss spit on the ground Aura Mastery now can tell people to move :).

Thank you again,

If you need anything please ask,

Benjamin aka Kabooum, EU French Stormfather

PS : Important, in the modification there is 2 things :
 - My modifications related to the Cast Trigger
 - I have also merge the code from the live version (API 9) and the github version (API 8)