Gmetad's internal metrics and graphs.

This is part of the GSoC 2014 "Internal Ganglia server metrics" project.

There are two wikis that come with it and that will also be transfered later on:
https://github.com/OHamm/monitor-core/wiki/Gmetad-Internal-Metrics-(developers)
https://github.com/OHamm/monitor-core/wiki/Gmetad-Internal-Metrics-(users)

Note that the google charts graphs should not be added to the main package because of license conflicts, flot charts isn't a problem though.

If you have any remarks or improvements, please leave a message and I'll see what I can do!