Parse all commands with token_get_all to figure out intent

[apinstein]

This helps us solve gh-4, gh-5, gh-8, gh-9

If we run all input thru the tokenizer, we should be able to figure out where we're at in the current scope to improve auto-complete, allow multiline functions, tell if things have return values, etc.

http://us.php.net/manual/en/tokens.php