Merge pull request #175 from mbebenita/master

Fixes.
URI mangling using base64
merge upstream
Fixes drawRoundRect
Merge pull request #177 from yurydelendik/drawRoundRect

Fixes drawRoundRect
turn off uri mangling by default
switch debug/release flags
Merge pull request #176 from artcompiler/mangling

URI mangling using base64 and other name fixes
Don't patch overriden traits.
Fix callpropvoid
Don't trace colors in the browser.
Mark calls as pristine by default to avoid .call/.apply
Fix coerceString in builder.
Don't pin findProperty to regions, probably unsafe but unlikely to cause problems.
Mark calls to coercions in method prologue as pristine.
Add pristine property to IR.Call
Propagate vector types better in the inferrer.
Factor out def-use chains.
Better function names to help with debugging.