Reduce size of minified build

[adamrenklint]

• Declare var self = this at top of each method, as this will never get renamed
  • Can then remove a whole bunch of fn.bind(this) statements
• Mangle all private/underscored properties and methods
  • To verify that underscored methods are never used outside of a class, use checkprivate
  • What about methods that are used by other parts of the system, but that are never meant to be consumed by outside developers? Could these also be mangled?