Fix incorrectly locked dep on i18n gem
Add statsd and set up a global statsd reporter
Add shortname attribute on Application

An application has a "shortname" which will be used to determine the name of
its deploy metrics in graphite. This should correspond to the name of the
govuk::app type defined in Puppet.

This commit adds a "shortname" field which defaults to the repository name (i.e.
"bar" if "repo" is "foo/bar"), but can also be set explicitly.
Add interface for viewing and updating shortname
Record application deployments to Statsd

Every time a Deployment object is created for a particular application, register
that deployment by incrementing a statsd counter for that application.
Be stricter about what we accept for repo

Since shortname now defaults to the second half of the slash-delimited "repo"
field, we should probably be a little stricter about what we accept in this
field. Add a simple regex validator that enforces that repo is in the form:

    <anything but whitespace or a slash>/<anything but whitespace or a slash>
Add shortnames to db/seed.rb for apps that need them
Use Object#blank? rather than (nil? or empty?)

This makes me feel ill inside (Object#blank? is a Rails monkeypatch) but
apparently it's more idiomatic...
Merge pull request #27 from alphagov/deploy-stats

Deploy stats! (Oh, and application shortnames)