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

Sdfits