MARKOV: More efficient implementation for computing stationary distributions
[range(n)] replaced with [list(range(n))] in test_stochmatrix.py (for python 3)
READTHEDOCS: Adding a readthedocs requirement file separate from what we need to build.
RTFD: Added sphinx requirement.
RTFD: Removed sphinx version in piprequirements to normal.
Merge branch 'master' of https://github.com/QuantEcon/QuantEcon.py into mc_tools
MARKOV: Graph theoretic routines implemented in DiGraph
DOC: fixed readthedocs
ENH: added tic, tac, toc functions
Docstrings in numpydoc format.
Merge pull request #83 from albop/timing

ENH: added tic, tac, toc functions
minor corrections
Merge branch 'master' of https://github.com/QuantEcon/QuantEcon.py into mc_tools
Minor edits in the docstrings
Added "(object)" in graph_tools
Introduce list_of_array_equal to compare lists of ndarrays
period, is_aperiodic extended to reducible Markov chains
eq_(len(s), len(t)) added to list_of_array_equal
Merge pull request #79 from oyamad/mc_tools

MARKOV: More efficient implementation for computing stationary distributions
minor correction