document constants and avoid scipy for Boltzmann
Merge pull request #52 from tjhei/document_constants

Document constants and avoid scipy for Boltzmann
automating setting of the equation of state
fix examples
fix user_material example
Test for numba performance improvements
Merge pull request #38 from ian-r-rose/test_numba

Test for numba performance improvements
fix test output
Merge pull request #54 from tjhei/fix_tests

fix test output
fix SolidSolution
fix test output
convert tabs to spaces
fix test
fix typos
Add the ability to specify a different reference temperature
change mgd to include new reference temperatuer option.
Moved one line after doc string.
Use new style classes
rework Mineral.set_method

Now the method is always set to something (at least None) and the
warning to check for a change in method now works with method objects.
make EOS a new style class