updated notebook and docs

docs/build/doctrees/environment.pickle

...rees/examples/notebook_luminosity_function_single.doctree

...sphinx/examples/notebook_luminosity_function_single.ipynb

...inx/examples_notebook_luminosity_function_single_18_1.png

...inx/examples_notebook_luminosity_function_single_23_1.png

...ges/examples_notebook_luminosity_function_single_18_1.png

...ges/examples_notebook_luminosity_function_single_23_1.png

...modules/binarycpython/utils/custom_logging_functions.html

docs/build/html/_modules/binarycpython/utils/dicts.html

docs/build/html/_modules/binarycpython/utils/ensemble.html

docs/build/html/_modules/binarycpython/utils/functions.html

docs/build/html/_modules/binarycpython/utils/grid.html

...ild/html/_modules/binarycpython/utils/plot_functions.html

...odules/binarycpython/utils/population_extensions/HPC.html

...thon/utils/population_extensions/Moe_di_Stefano_2017.html

.../binarycpython/utils/population_extensions/analytics.html

...ules/binarycpython/utils/population_extensions/cache.html

...les/binarycpython/utils/population_extensions/condor.html

...les/binarycpython/utils/population_extensions/dataIO.html

...n/utils/population_extensions/distribution_functions.html