utilities, operator{==,!=}

- new comparison functions for neurons:
- utility to compare doubles.
neuron_network fixes and tests
Merge branch 'network' into dev
travis notifications
Merge branch 'master' into dev
utilities enhancement
truth_table, fitness, evolution, random, colony
fix out neuron
minor modifications
Merge branch 'fitness' into dev
minor fixes
start plot
minor refact
add possibility to choose purge strategies
parse naively command line arguments
dependency gnuplot
first functionning plot
corrections, refact
Merge branch 'mod' into dev
Merge branch 'plot' into dev

Conflicts:
	makefile
	src/main.cpp