CSSLint: Suppress some currenlty unfixable rules

Mosty introduced after the inclusion of the jQuery mobile CSS.
Some options should be re-evaluated at a later time.
Fixes gh-1468
Cleanup: Change comment type for SCSS compat

/* comment blocks will cause Sass to output an empty rule if they are
nested within a rule block
Merge pull request #1480 from nschonni/suppress-jquery-mobile-csslint-warnings-gh-1468

Suppress jquery mobile csslint warnings gh 1468