Separated code into two test methods
Added new workaround for HtmlUnit's .innerHTML
Added test to make selector ignore non-disableable elements in :disabled
Merged test files and added extra cases for :checked
- <input> that is not radio or checkbox should not be considered
:checked, even if they have that attribute.
Removed unecessary test
Added more tests for .is() and :checked
Merge pull request #11 from seleniumQuery/xpath_go1

Attempt to merge some changes from xpath branch