Implement private variables, getter/setters and methods using Symbols#685

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Arnavion wants to merge 5 commits intomicrosoft:masterfrom Arnavion:symbol-for-privates

Commits on Sep 29, 2014

Add -symbolForPrivates compiler flag.
Arnavion
committed
Emit one __symbol function declaration per file.
Arnavion
committed
Change emitMemberAccess to take in the whole member declaration.
Arnavion
committed
Add functions to get whether a property access is for a private property or a static property.
Arnavion
committed
Use Symbol for private members.
Arnavion
committed