adding .travis.yml to start using Travis CI
Merge pull request #241 from stan-dev/feature/travis-ci

Start using Travis CI
sending notification emails to mc.stanislaw@gmail.com
Merge pull request #243 from stan-dev/feature/travis-ci

travis-ci: changing notification emails
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/parser_error_reporting