Ajax: use anchor tag for parsing urls

Fixes gh-1875
Closes gh-1880
Support: Correct iOS 8 support test results, re-arrange entries
README: various text fixes

Thank you @essamjoubori, @bcbcb, @namlede

Closes gh-1926
Closes gh-1927
Closes gh-1928
Sizzle: update to 2.1.1