plotter refactoring, created AbstractPlotter, using Template Method pattern
implemented abstract plotter class and derived class to plot with python
implemented derived plotter class to plot with R as well as the skeleton code for the derived plotter class to plot with Gnuplot
filled skeleton code of derived plotting class for plotting with gnuplot
finished derived plotter class for plotting results with Gnuplot
splitted plotting funcion in AbstractBenchmark
cleaned up sources (deleted Gnup,Pyp,Rp classes which are now replaced by derived plotter classes) / replaced 'make' with '' in Makefile
provided possibility to just plot results (command: 'make plot') without having to execute a whole benchmark first
Added proper error handling to plotter files

* Check if chosen result file for plotting is available
* Check if needed script files exist
removed 6 lines of out-commented lines

PlotterGnuplot.cpp
PlotterPython.cpp
PlotterR.cpp
added error handling to AbstractPlotter::pdfcropResult()

Throws perror if path to result files cannot be opened
Fixed argument passing to shell script selectBenchmarks.sh

Now excluding the first argument which is the path to the benchmark binarys
Merge branch 'feature_plotterRefactoring'