Use exclude config from CSSComb

[wardpeet]

CSSComb doesn't uses the exclude from config.
I added a check that grunt only processes when necessary, else it copies the files.

"exclude": [
        ".git/**",
        "node_modules/**",
        "bower_components/**",
        "**/exclude2.css"
    ],

[tonyganch]

Hello, @wardpeet. I'm very sorry to keep you waiting for review.
Are you still interested in merging this pr?

[wardpeet]

Yes please :) If i need to change anything just let me know.

[tonyganch]

Can you please rebase your branch onto master? There are now some conflicts preventing me from easy merging.

[wardpeet]

Will rebase today :)

[wardpeet]

Sorry for the delay, I rebased to master