docs(content): update Angular 1.2 mentions to Angular 1.3

Angular 1.3 docs now describe the process of using this version instead of
the older 1.2 that is the latest stable version.

Also, update jQuery 1.10.x mentions to 2.1.x.
chore($sniffer): Remove $sniffer.msie & $sniffer.msieDocumentMode

Since msie is now set to document.documentMode, it's not necessary to keep
the documentMode in a separate property.

Also, msie is a variable global to Angular source so there's no need to
replicate it in $sniffer.

Closes gh-9496