Release v1.1.2

New: Add setInterval, clearTimeout, clearInterval support
New: ^ operator be used to find properties existed in both A and B
object
New: Add error position info in Runtime Exception
Fixed: Return does not work in switch
Fixed: Syntax error exception
Fixed: Result of float calculate is incorrect
Fixed: && operator returns incorrect result when float calculate
Fixed: Other bugs (with test-cases)
Changed: Make ArrayObject public