Fixed the segfault when the simulation terminated.

The problem was, that the clock, forwarding- evaporation- and
reinforcement policy have been deleted first by the AbstractARAClient
and the Environment and later by the simulation because those classes
are also registered cSimpleModules.

Fixes #39
Small cleanup
Removed the .git folder from the .project file (eclipse project)

Previously the folder has been part of the period workspace refresh (slow)