Locker Service introduces better security for your Lightning Components. Start evaluating your code now so that it will be Locker Service ready by Summer '17!
LockerService Documentation
https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/security_code.htm
Please join the Customer Architects community:
www.salesforce.com/success-architect
Stackexchange - Locker Service Tag
http://salesforce.stackexchange.com/questions/tagged/locker-service