Add documentation folder with basic sphinx site.
Rename documentation folder to `docs`.

This is during an effort to get Readthedocs to recognize the sphinx
location.
Remove Sphinx conf `numpydoc` requirement.

This will likely be needed later, however, the requirement is
affecting the RTD build.
Add statement about documentation development status.
Update Sphinx to use `.rst` extension.

This because Read The Docs (RTD) seems to work smoother with this.
Update GitHub readme to point to RTD documentation.
Add LICENSE.txt file
Add eul2quat function. Currently only accept scalar. Need to do input checking.
Add input_check_1d function to do 1-D input check.
Non-array (e.g. float or int) will be converted into 1-D array
2-D arrays will be reshaped to 1-D and this will check for Nx1 type input.

Implement input checking with eul2quat. Need to write the documentation for
this function.
Rename eul2quat() as angle2quat() as agreed upon.
Rename input_check_1d() to input_check_Nx1() for clarity.
Begin quat2angle(), still emtpy.
Function quat2angle() completed. Add input_check_Nx3().
Need to write docstrings for everything.
Added documentations for angle2quat() and quat2angle()
Added docstrings and examples for angle2quat and quat2angle
Correct expected output to match python output (string comparison)
Added quat2dcm() with docstrings.
Add dcm2quat with docstrings
Added qmult for quaternion multiplication. Tested for vector operation. Need examples in docstring.
Fix qmult for N (more than 1) inputs.
Fix input_check_Nx1 and input_check_Nx3, flatten output to 1-D array when able
Added wgs84.py as a module containing all the wgs84 constants

Added earthrad function to calculate the earth's radius.
Added llarate function to calculate the latitude, longitude, and altitude
rate given Earth relative velocity and position.
Calling East-West radius as Transverse Radius and North-South radius as
Meridian radius as Groves define them.