This helps when piping the output of `python setup.py --long-description` to other programs like rst2html.py.
Comma-delimiting branch names in the build status image URL for Travis-CI does not currently work, so this commit switches to not specifying any branch names until this is fixed. See also the Travis-CI issue: travis-ci/travis-ci#731
…tory not present. Prior to this commit, running test_pystache.py from a downloaded sdist has a test failure because the spec tests are not found.