When detecting html in init, ignore html characters within quotes, brackets, and parens as well as escaped characters which are valid in selectors. Fixes #11290.

Move quickIs to Sizzle; Remove duplicate id matching in init; Added selector caching to Sizzle. Fixes #11826.

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Update Sizzle: rewrite attributes handling to be simpler and more widespread when independent from jQuery. No changes to jQuery's attribute handling.

Although we use a lot of iframes in the test, the IE document mode is set by the parent document so we just need a single X-UA-Compatible in the main file.

http://msdn.microsoft.com/en-us/library/cc288325(v=vs.85).aspx

Closes gh-666, thanks to @rkatic!

Grunt: Update testswarm task to use new module filter, reduces duplication when running, should speed things up

I can't get the current test to fail locally or in Browserstack, but suspect it may have something to do with badjson.js.

Also removes fake IIFEs ffrom effects.

The `event.metaKey` property is undefined there so we ensure it's set to `false` for lack of a better default. The `originalEvent.metaKey` property is untouched if you prefer to make other guesses about the platform or key state.

This is pretty much impossible to unit test since it is not only platform dependendent but also only executed for native browser events.

No unit tests were harmed in the removal of this hack.

Here is hoping everything works with the full build and the build without ajax... looking at you @dmethvin ;)