Basic travis-ci config

https://travis-ci.org/jayvdb/httplib2/builds/42097318

Some tests are failing because of a problem with the test server
http://bitworking.org/projects/httplib2/test/303/303.cgi

We can remove dependency on the bitworking server for the asis test files by using https://pypi.python.org/pypi/asis

Most of the dynamic cgi tests could be rewritten as asis test files.