Update jscs to 3.0

[paladox]

Jscs is now deprecated and will no longer be updated.

It will only have bug fixes for three months and instead they are moving to eslint.

[gustavohenke]

Could you please take a look on the errors that are going on in the unit tests?

[tclindner]

@paladox would you mind reviewing your PR? I'm interested in your update!

[markelog]

Yeah, i was waiting to do the support for 3.x release but it was shaky for a while, still is though, i'm hoping incoming 3.0.4 would cover most of the issues

[paladox]

Ok, I'm not sure why it is failing

I'm getting this in 0.10

236Testing methods.js...............Warning: Object # has no method 'getSourceCodeLength'� Use --force to continue.

and this in 0.12

236Testing methods.js...............Warning: undefined is not a function� Use --force to continue.

and this in 4 and 5

238Testing methods.js...............Warning: element.getSourceCodeLength is not a function� Use --force to continue.

[paladox]

I used verbose and tracked it down to this line

https://github.com/jscs-dev/grunt-jscs/blob/master/test/methods.js#L279

per https://travis-ci.org/jscs-dev/grunt-jscs/jobs/130201258