Update jshintrc for a common global we reference.

See #5613

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8377 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Javascript: first pass at improvements for jshint

See #5613

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8378 cdf35c40-ae34-48e0-9cc9-0c9da1808c22