added css linting (fixes issue #28)
added css linting (fixes issue #28)

nlesc-sherlock/punchcardjs-demo,nlesc-sherlock/punchcardjs-demo,nlesc-sherlock/punchcardjs,nlesc-sherlock/punchcardjs,nlesc-sherlock/punchcardjs-demo,nlesc-sherlock/punchcardjs