Auto-transform reserved words to be quoted in non-es5 mode:
	1. Class methods uses a computed member expression on the prototype when the method name is a reserved word
	2. Destructering would use a computed member expression when the key to pull is a reserved word
	3. Object concise method will qoute the identifier (i.e. make it a string literal) when it's a reserved words
	4. reserved-word-visitor is a default visitor in non-es5 mode that would handles everything else:
		a. Handles properties in object expressions
		b. Handles member expressions
Merge pull request #30 from facebook/reserved-words

Auto-transform reserved words to be quoted in non-es5 mode: