First seed_gen test
add smoothing
visualizable seeds
add grow_speed
Merge branch 'master' into generation

Conflicts:
	src/engine/main_engine.ml
add a lot of comments, change names
add euclidian minimal distance between seeds and random_smoothing
Dijkstra optimisation, generation takes 0,5 seconds now on 100*100 :)
fix doc
Merge branch 'generation' of https://github.com/GL-MPRI-2014/GL_MPRI_2014