use strategies.tree.greedy in fu
use uncompiled versions of CTR# in trees
add comments for chains and choices
fu takes objective function
add objective test
remove RL1/2 CTR1234 from fu namespace
remove underscores from RL1/2 CTR1/2/3/4
remove functools.partial import
change objective -> measure in fu
add docstring for measure in fu function
expose max and pow keywords on TR* routines
simplify FU dict
Merge pull request #1903 from mrocklin/fu-tree

Fu tree