Indentation fix for issue #176.
bug #371 Indentation fix for issue #176. (keradus)

This PR was squashed before being merged into the 0.5.x-dev branch (closes #371).

Discussion
----------

Indentation fix for issue #176.

Rewrite Fixer to use tokenizer  so now it do not touch variable's content.
Fix for issue #176.

Commits
-------

6278a1f Indentation fix for issue #176.