caleb/ligo-comprehensive @ c83ef76a2474f526f183bdd5cbab4c4b45c7d6f5

Caleb Fangmeier c83ef76a24 rewords the author's note		8 lat temu
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gt_etalon.py	ad83996645 Improves formatting and adds content on principle of operation.	8 lat temu
pdh_demo.py	bd84fef668 Addition of a great deal of detector description	8 lat temu
pdh_demo2.py	c83ef76a24 rewords the author's note	8 lat temu