Adding support for jQuery selectors; uses the jQuery in the browser window
Added first sizzle integration test, fixed the bug it found.

Finally back on this, sorry for the delay folks!  Still teaching myself
python.  Duplicated the CSS table locator integration test as starting
point and immediately found a bug.  Fix is included: wasn't checking for
jquery/sizzle prefix in table keywords.
Added jquery/sizzle locator tests.

Simple tests for jquery/sizzle locator, built from the existing links
and tables tests.  Includes moving the previous commit's tests to
the sizzle suite, so that only one suite will fail if jquery cannot be
loaded.

I believe that the tests can be marked non-critical, which might be a
good thing since they can fail if jquery cannot be downloaded.  I'll
look into this soon.
Merge pull request #161 from edmi-nz/master

Add support for jQuery selectors (uses window's jQuery)