Update OpenSecrets.org API module to reflect current structure#2

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nhfruchter wants to merge 6 commits intobpilkerton:masterfrom

nhfruchter:master

Commits on Feb 25, 2017

Add requests to requirements
Nathaniel Fruchter
committed
Update documentation to reflect new class structure
Nathaniel Fruchter
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Use requests for API calls; structure class to not use staticmethod for calls
Nathaniel Fruchter
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Merge branch 'use-requests'
Nathaniel Fruchter
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Add new independentExpend API call
Nathaniel Fruchter
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Add API call docstrings
Nathaniel Fruchter
committed