Merge pull request #1 from akshayparopkari/master

Created and updated docstring for split_phylogeny() in util module
Merge pull request #3 from akshayparopkari/master

Updates to util.py and test_util.py.
Merge pull request #4 from akshayparopkari/master

Unit testing biom_calc.py and adds support for Travis CI
Merge pull request #6 from akshayparopkari/master

Updates test_biom_calc.py for PEP8 compliance