spell-commit: be explicit about dictionary

We should always use english dict.
New script: osf-latest-coverage

Prints a link to result of latest {name}-coverage job for a project.
For example:
$ ./osf-latest-coverage glance
http://logs.openstack.org/35/35bf0af69cc128f7878339c9904f9af487e8df8c/post/glance-coverage/bc56fe2/cover/
$ ./osf-latest-coverage openstack/neutron
http://logs.openstack.org/49/49efd608d395ecede1f8074d17c6a8230ffbb1c6/post/neutron-coverage/ed76f63/cover/
$ ./osf-latest-coverage stackforge/taskflow
http://logs.openstack.org/9d/9de052c30d04b33f0be9eb8c29f5c1d95e6e6ddc/post/taskflow-coverage/ba6bce6/cover/