Allow n_rounds to be passed to stability_oracle_factory

[zhang-ivy]

Fixes some problems introduced by #3

[maxentile]

Ahh, good catch! A quick search of the repository for other references to n_steps suggests you've now covered all the places this needs to be added.

Perhaps if we later expand the tests / examples, we could make sure the new arguments are covered by a new test.

[zhang-ivy]

Hmm, one of the tests for mac os is failing:

_______________ ERROR collecting thresholds/tests/test_bisect.py _______________
ImportError while importing test module '/Users/travis/build/choderalab/thresholds/thresholds/tests/test_bisect.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../../miniconda3/envs/test/lib/python3.5/site-packages/numpy/core/__init__.py:16: in <module>
    from . import multiarray
E   ImportError: dlopen(/Users/travis/miniconda3/envs/test/lib/python3.5/site-packages/numpy/core/multiarray.cpython-35m-darwin.so, 2): Library not loaded: @rpath/libopenblas.dylib
E     Referenced from: /Users/travis/miniconda3/envs/test/lib/python3.5/site-packages/numpy/core/multiarray.cpython-35m-darwin.so
E     Reason: image not found
During handling of the above exception, another exception occurred:
thresholds/tests/test_bisect.py:1: in <module>
    import numpy as np
../../../miniconda3/envs/test/lib/python3.5/site-packages/numpy/__init__.py:142: in <module>
    from . import add_newdocs
../../../miniconda3/envs/test/lib/python3.5/site-packages/numpy/add_newdocs.py:13: in <module>
    from numpy.lib import add_newdoc
../../../miniconda3/envs/test/lib/python3.5/site-packages/numpy/lib/__init__.py:8: in <module>
    from .type_check import *
../../../miniconda3/envs/test/lib/python3.5/site-packages/numpy/lib/type_check.py:11: in <module>
    import numpy.core.numeric as _nx
../../../miniconda3/envs/test/lib/python3.5/site-packages/numpy/core/__init__.py:26: in <module>
    raise ImportError(msg)
E   ImportError: 
E   Importing the multiarray numpy extension module failed.  Most
E   likely you are trying to import a failed build of numpy.
E   If you're working with a numpy git repo, try `git clean -xdf` (removes all
E   files not under version control).  Otherwise reinstall numpy.
E   
E   Original error was: dlopen(/Users/travis/miniconda3/envs/test/lib/python3.5/site-packages/numpy/core/multiarray.cpython-35m-darwin.so, 2): Library not loaded: @rpath/libopenblas.dylib
E     Referenced from: /Users/travis/miniconda3/envs/test/lib/python3.5/site-packages/numpy/core/multiarray.cpython-35m-darwin.so
E     Reason: image not found

[jchodera]

We probably just need to update the repo to use the most up to date cookiecutter, since .travis.yml and devtools/ are out of date.