Merge branch 'release/0.4.2'
0.4.2
Merge branch 'release/0.4.3'
Code cleaning
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	bin/chemex_mc.py
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	bin/chemex_mc.py
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	chemex/experiments/cpmg/ch3_mq/data_point.py
	chemex/fitting.py
Updated the caching function 'lru_cache' with a newer version found on ActiveState : http://code.activestate.com/recipes/578078-py26-and-py30-backport-of-python-33s-lru-cache/