Fixed the retrieval of values for radio groups
Fixed the selection of option in a radio group
Added support of non-textual fields in setValue
Removed outdated test skipping

The test has been moved in the driver testsuite, and it is passing with
the new logic handling options.
Fixed the encoding of the XPath locator

The selenium server does not receive the XPath as UTF-8, thus breaking
the matching for accentuated chars.
Fixed the custom triggering of change events

The events must be triggered in the window under test, not in the
selenium window. This requires using the ownerDocument of the element to
access to the document.
Changed the finding of elements to use Selenium rather than the source
Merge pull request #52 from stof/fix_tests

Fix tests