Merge pull request #4 from soundnsilence/master

PermutationParameter crossover operators & techniques
Added python code that creates graphs in matplotlib as a replacement to plots being produced by gnuplot
Implemented parallel compiling
Added field in stats.py to specify xlim and ylim
Renamed stats_old.py to stats_gnuplot.py
Python 2.6 compatibility fix
Removed hard-coded argument and added new argparse argument to ensure that ylimit can be easily specified to the user
Merge pull request #5 from deepakn94/master

Added python code that creates graphs in matplotlib as a replacement to ...
Correctly close session at end of main
jansel's comments
Fix halide benchmark by ignoring stderr spam
Basic version of halide settings file generation using call-graph-dumper
tool
Merge pull request #6 from samfin/master

Implemented parallel compiling
stats version 2