Add CSS lint support

[mpapis]

http://csslint.net

[gy]

If it's not too much trouble can you rebase and force push onto this branch so we know which commits apply for this PR. Thank you @mpapis.

[mpapis]

updated, down to one commit\

[coveralls]

Coverage remained the same when pulling 5f4495c on features/csslint into 831d8b2 on master.

[jish]

Is this just for documentation?

[mpapis]

for now just documentations so others know in future what was used for it, but it can be later extended to also serve as source for updates

[jish]

Looks pretty good. (:

[mpapis]

updated

[jish]

I merged in master, but the tests look like they're failing... =/

[mpapis]

it's the rubinius gems, nothing related to actual tests ... I will try to look into it (in travel till Friday)

[mpapis]

removed support for rubinius, it causes problems also in other rubies, as long as they can not decide to build something that works out of the box we can not support it

[mpapis]

and it works just fine now (still waiting on jruby - but it should be all fine)

[coveralls]

Coverage remained the same when pulling baec057 on features/csslint into a9872e3 on master.