Run tests in IE 10.

IE 10 doesn't support the charset=x-user-defined trick and doesn't
interpret conditional comment. The only way do download a zip file is
to use the responseType option... which isn't compatible with jQuery.

Good bye, jQuery :-)
Add a unit test for #33
Update firefox support on a.download

See https://bugzilla.mozilla.org/show_bug.cgi?id=676619
Explode the test/index.html file

This patch explode the test file into :
* test/test.js : the unit tests
* test/browser-test-utils.js : the browser specific stuff (loading
  binary data)
* test/browser-ie-test-utils.js : the IE <= 9 specific stuff
Update QUnit (1.2.0 => 1.11.0)
Launch tests in nodejs with node-qunit

Now that the test are separated from the html page, we can do this :)
Merge pull request #37 from dduponchel/ie10_and_tests

IE10 and tests