Grunt: simplify list of CSS files used in the build tasks.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8766 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Grunt: simplify list of JS files used in the build tasks.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8767 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Grunt: simply jsvalidate syntax in build config, and also run on minified JS files.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8768 cdf35c40-ae34-48e0-9cc9-0c9da1808c22