Fix failing support test in IE6/7
Add unit tests for jQuery.grep. Close gh-1345.
Add Travis CI config for PR testing
Travis: Also install bower
Fix #14351: Update Sizzle
(cherry picked from commit 1d57ffe5fff06928aac53813342d33ec6bddd531)
Ref #14313: NaN detection. Close gh-1352.
Adjust prefilter test to error on string indexing in oldIE
Use charAt instead of string indexing for oldIE's sake. Fixes #14356.