RIOT-OS/RIOT — pull request #1424 by phiros (2014-07-15 13:26:46+00:00)
Title: new feature: gtimer; a global timer/clock for clock sync protocols

This PR will add gtimer an adjustable clock which can be used in conjunction with clock sync protocols
in order to provide a network-wide synchronized timer.
Currently it is just an adjustable clock (rate and value can be changed).
However, we plan to add some vtimer like capabilities to it later on.

IMPORTANT: I will refactor this code in the next few weeks. I will ping this PR when the code is ready for a
code review. Don't waste your time by reviewing this code now.