Add Travis CI config for PR testing
Add unit tests for jQuery.grep. Close gh-1345.
Travis: Also install bower
charAt -> string indexing. Close gh-1359.
Adjust prefilter test to error on string indexing in oldIE
Fix #14351: Update Sizzle
Ref #14313: NaN detection. Close gh-1352.
(cherry picked from commit 0bc0a69026ce4c1ac570a729d3c975a4a55d0ff4)
Small adjustment to prefilter test. Follow the right path for prefixes.
No ticket: fix code style inconsistencies. Closes gh-1361