refactor Update Syn

Close #33 close #491
fix #558 test on utils.Dom fails in Chrome

In Chrome and Safari the test test.aria.utils.Dom fails in attester because the body of the iframe content doesn't have an height and doesn't scroll properly

Close #581
refactor Stricter options on JsHint

Enable more strict option on JsHint and update the package dependencies.

Close #244 close #579

Conflicts:
	package.json
feat #587 semi-transparency on test iframe

If the iframe test fails and the iframe is not disposed, it's hard to
see if there was some error or no (on beta.html).

In general it's good to be able to see the status of the current test.

Close #587.
fix #591 failing template tests due to wrong usage of Syn

After updating Syn in 104a7f2cddcabfe50919ce546518edb119ef24ff, the tests (fixed in this commit)
were failing on IE7 because they were using Syn incorrectly, trying to click on an invisible
element.
1.4.6