Merge branch 'hotfix-1.0.1' into develop
Implemented ranges of validity

The code now pays attention to whether or not the color you are feeding
into the polynomial fit is within the valid range of the fit. If the
color is invalid, then the bolometric correction is None. The
calculation of Lbol has been modified so that if the bolometric
correction is None, then log(Lbol) is also None.
Merge branch 'validity_ranges' into develop
Initial test coverage and refactoring

- New library directory structure
- Test runner executable
- Initial test coverage pattern
Changed function and variables names for clarity
Tests for set_coefficients passing

Created a new function that sets up the correct polynomial coefficients
when you tell it which color you are using. Tests are all passing.
Added helpful messages to exceptions
Modified set_coefficients to handle setting range

Rather than writing a separate function to handle setting the range min
and range max, I modified set_coefficients by renaming it set_constants
and having it return a tuple containing a list of coefficients, the min,
and the max of the validity range. set_constants is now the one-stop
shop for defining which polynomial to build.
Implemented validity check

Function validity_check makes sure that the color_value given is within
the valid range of the polynomial fit
Bolometric Correction implemented

Finished implementing the calculation of the bolometric correction, and
the bc_polynomial module has complete unit tets coverage.
Refactored luminosity code, tests in place

Refactored the code that actually calculates the luminosity and put it
under unit testing. I need to verify that I have complete test coverage,
and then this branch will be ready to merge into develop.
Forgot to add test to git.
Updated docstrings
Updated docstrings again
Added footer to test_luminosity.py
Merge branch 'test_coverage' into develop
Cleaning up over-specified imports
Changed test to AlmostEqual, since reals are being compared
Updating README, added background section
Changed README to a markdown file