Add travis config to deploy snapshots to sonatype.

This needs the actual sonatype username and password added
after running through a 'travis encrypt' command.

Only try to deploy from one entry in the matrix, so pulled
openjdk6 out of the main jdk matrix and added a separate
entry with its own script with the deploy command.
Fix up travis include synax for sonatype publish
Don't attempt to publish jruby gem from Travis
Ignore gedit droppings
Merge branch 'travis-sonatype-snapshot-publish' of git://github.com/tomdcc/cucumber-jvm
Added my encrypted sonatype credentials so we can deploy. Closes #517,#528