[TIMOB-17924] Enable JS debugger
Merge branch 'v20' of github.com:appcelerator/tijscore into v20-debugger

Conflicts:
	JavaScriptCore-iOS.xcconfig
Merge pull request #17 from pec1985/v20-debugger

[TIMOB-17924] Enable JS debugger
[TIMOB-18096] Collect all orphans

TiGarbageCollect now collects all orphans so we van respond to memory
pressures outside the JSCore VM
Merge pull request #18 from vishalduggal/timob-18096

[TIMOB-18096] iOS: Proxies not being released