Most return types should be JQuery

Since select2 is a JQuery plugin, it support chaining therefore the majority of methods return a JQuery object (typically the original JQuery object besides 'container' which returns the container element).
Merge branch 'master' of github.com:styfle/DefinitelyTyped into styfle-master

Conflicts:
	select2/select2.d.ts
Merge branch 'styfle-master'