BF: enable timeout on the splashscreen

otherwise it obscures the first-run wizard
Merge pull request #314 from jeremygray/master

splashscreen timeout
ENH(BIG): adding travis-ci.org and coveralls.io support
Adding  python-tables to travis setup (probably not used -- but need to trigger a new build)
adding forgotten xvfb and remove absent/optional pyo and tables
Merge branch 'master' of https://github.com/psychopy/psychopy