added clang support and removed g++ support
Refined the libARA folder structure

I did also remove unnecessary includes in the Makefile
Moved some of the core tests in their right directories (like in src/core)
Created the first abstract Logger interface
Implemented the Logger interface as Mock
The Address has been extended by a toString() method which is usefull for the Logger
Improved the Logger interface by the addition of varargs for the log text
Improved the tests/Makefile: We do no longer need to provide the LD_LIB_PATH with the libARA folder for runLibAraTests
Included the first logging into the AbstractARAClient (more to come later)
Added convenience method getDestinationString() (and others) to Packet
More logging for the ARAClients
Prepared linking log4cxx into the tests and documented this dependency
Proofed a memleak in log4cxx (or I am using it wrong) :(
Set the failing log4cxx test to IGNORE

Until we understand and fix the memory leak we do not use log4cxx
Wrote some more tests for the logger interface
First version of the very SimpleLogger
OMNeT++ ARA does now use the SimpleLogger for debugging purposes
More logging for the AbstractARAClient
The SimpleLogger in the OMNeT++ ARA client does now output the nodes name
Merge branch 'logging' into develop