Test cleanup

Quotes and examples -> example
Add node stream-compliant Topic.toStream
Merge pull request #123 from megawac/streams

Topic.toStream
Make Topic streams pipeable
Unsubscribe from topic in test
Merge pull request #124 from megawac/streams

Make Topic streams pipeable
Changed to release version of ROS debian packages.
Make Browserify compatible
Update .travis.yml
Update .travis.yml
Merge pull request #125 from megawac/patch-2

Make Browserify compatible