Added Travis integration.

The test is just compilation for now.
Support both "/usr/bin/nodejs" and "/usr/bin/node" when compiling JavaScript.
Show build status of master branch.
Install "sass" and "compass" as gems to get recent versions.
We need Sass 3.2.0 or newer.
Use "nodejs"/"node" from PATH.
Merge pull request #1 from fancycode/travisci-integration

Travis CI integration