Add mongo service to travis

This should allow travis ci to connect to mongodb.
Comment out require debugger

It wasn't clear to me why a debugger require statement was being
left in the source code, but it seemed to be making Travis CI
builds fail.  I commented it out in the event was necessary somehow.
Update a comment about debugger in cucumber

This makes a little clearer why the require debugger statement
was commented out.  Uncomment it if you need to debug cucumber
tests, but don't commit it or it will break Travis CI.
Merge branch 'develop'
Merge branch 'master' of github.com:SciMed/rubeque