Test node 0.11 unstable but allow it to fail

Will allow advanced notice if new node changes may break something,
without failing a build
Remove redundant JSHint directives

This are all covered by the existing .jshintrc file
Merge pull request #50 from nschonni/add-node-unstable-to-travis

Test node 0.11 unstable but allow it to fail
Merge pull request #52 from nschonni/remover-redundant-jshint-directives

Remove redundant JSHint directives