Remove test_long_identifiers from test_sqlalchemy.py because SQLAlchemy removed the 30 character limit on identifiers.

See https://bitbucket.org/sqlalchemy/sqlalchemy/commits/d5fcb7b91bc16ebb22ca1e34e6a734923d6495a8 and http://code.google.com/p/pymssql/issues/detail?id=44
Add a .travis.yml file for folks who have GitHub repos hooked up to Travis CI (only me? :-)