Made GBTSpecBlock
Unit tests for fits.SpecBlock.
Added missing unittest files.
Updated .gitignore.
renamed utils.py to file_utils.py
Removed unittests for deleted module.
Added GBT old spectrometer test data.
Initialization and setup of SpecReader working.
SpecReader now mostly works except history.
Merge pull request #8 from kiyo-masui/doc

Gets readthedocs to work.
Merge branch 'master' into sdfits
Minor documentation fixes.
Merge pull request #9 from kiyo-masui/sdfits

Sdfits