fixed FIXME color; added bundle to the list of ignored directories

The FIXME color was outputting like: 

```bundle/ruby/2.0.0/gems/i18n-0.6.9/lib/i18n/backend/gettext.rb:
  * [ 58] [{:foreground=>"magenta"}FIXME] po_parser includes \000 chars that can not be turned into Symbols
```

Also created an IGNORED_DIRS variable and added 'bundler' to it so I don't have to see all of the TODOs in my gems.