- 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

Subprojects need to gather but not report.

Doesn't work without the jar :)

Change-Id: I3124fbef27deeadfae59a9bddd41a8e82ee86d27
Reviewed-on: http://gerrit.dmdirc.com/4032
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>