Merge branch 'release/0.9z1' into develop
Make twill thread-safe.
Replace last? browser with get_browser().
Add .gitignore.
Merge pull request #5 from zenoss/feature/threadsafe

Please review branch feature/threadsafe
Merge branch 'feature/threadsafe' into develop
Merge branch 'develop' of https://github.com/zenoss/twill into develop
Version 0.9z1 -> 0.9z2.
Merge branch 'release/0.9z2'