Updated PERFORMANCE_MODE to correct issues with Array and to provide an optimized Dictionary type.
Merge branch 'performance-mode' of https://github.com/playscript/playscript-mono into perf_mode
Fix PERFORMANCE_MODE defines
Dictionary needs to be a dynamic class
Fix performance mode Array/Dictionary inheritence
Merge branch 'performance-mode'

Conflicts:
	mcs/class/pscorlib/Array.cs
Performance mode fixes

Changes:
- Revert optimized Array.splice behavior
- Fix Array.indexOf
- Remove accidental debug code change to Dictionary