Circle is configured with a user/pass in secure env vars
(not exposed to builds from forks).

In theory this allows it to push master builds to artifactory's
snapshot repository.

Unshallow the git repository if necessary, and fetch tags.

Both of these things are useful for versioning.

- Execute coveralls as part of tests, not afterwards
- Update script to plugins version to allow for files that don't exist
- Use jcenter for DMDirc plugin, to stop idea complaining

Change-Id: I6403ff3ab6c96a10c380646152571603ae3b83fb

Change-Id: Ice569c4b22d68aada4e5262c5c913f1cb7e3e861

Change-Id: I30a3d8ffb7f1316ee793902865813d895ef08dd9