Allow to configure periodic registration for mcollective servers.
Import shellcmd plugin.
Update from slivare repo.
Allow to configure ActiveMQ systemUsage limits.
Clean bits not yet merged into master.
Merge pull request #22 from gnubila-france/add_shellcmd_plugin

Add shellcmd plugin
Merge pull request #21 from gnubila-france/add_system_usage_configuration

Allow to configure ActiveMQ systemUsage limits.