Fixed end-of-line issues in mie.m
Single-file MATLAB implementation now accepts angles as 3rd argument

bhmie_matlab/mie.m
- Updated to accept a vector of angles as input. Previously, the number of
angles between 0 and pi was passed as an argument and the routine calculated
a vector of angles.
- Also renamed function to match name of .m file

bhmie_matlab/bhmie_matlab_interface.py
- Updated argument to clarify that we are passing in an angle
  instead of number of angles
- Improved comments and formatting

test_Mie_solutions.py
- Looping over array of angles and calling each Mie code for each angle
- Improved printing of results from each code