Updating .NET tests to mirror current getText behavior for title elements.
Reinstating separate-thread execution of JavaScript on Windows 8.

This functionality had been disabled in 2.26.1.2, because of crashes in the
IE driver on Windows 8. It seems likely that the COM object lifetime cleanup
that happened in 2.31.0.2 corrected these problems. There is a possibililty,
however, that the root cause of the Windows 8 crashes is still in place.
If that is the case, this change should be rolled back.