Bug AST toSource bugs 798642, 800616

https://bugzilla.mozilla.org/show_bug.cgi?id=798642
AST toSource on getter/setter inserting 'function' keyword

https://bugzilla.mozilla.org/show_bug.cgi?id=800616
AST toSource on Hex string literal remove

Fixes bug as described in log. Tests included. All tests passing.

Isolated fixes within #99