Merge pull request #6 from marchaefner/master

Bunch of fixes and minor enhancments
Added credits
Merge remote-tracking branch 'marchaefner/master'

* marchaefner/master:
  Add (some) support for (most) Unicode characters in identifiers.
  Add `for own` keyword.
  Fix issues with `_` and `$`.
Add `loop` keyword and indentation rule.
Remove `where` from keywords.

It has no special meaning in CoffeeScript.