caleb/ligo-comprehensive @ a23bef4ca8fecfe0e5ac5f90457760a22d40de5b

Caleb Fangmeier 182a35a942 Incorporate round 1 of Greg's comments.		%!s(int64=8) %!d(string=hai) anos
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gt_etalon.py	ad83996645 Improves formatting and adds content on principle of operation.	%!s(int64=8) %!d(string=hai) anos
pdh_demo.py	bd84fef668 Addition of a great deal of detector description	%!s(int64=8) %!d(string=hai) anos
pdh_demo2.py	182a35a942 Incorporate round 1 of Greg's comments.	%!s(int64=8) %!d(string=hai) anos