Add .travis.yml for Travis CI

with support for coveralls.io for code coverage tracking too.
README.md: Add Travis and Coveralls badges
Merge branch 'travis' of git://github.com/msabramo/sh into travis
adding environment vars for tests
adding osx to travis
more supposed python versions
make a time-sensitive test a little less sensitive
Merge branch 'travis' into release-1.10