Improvements to documentation and tests#1

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bolpin wants to merge 15 commits intogettyimages:masterfrom

Commits on Apr 6, 2014

added tags to .gitignore
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started to clean up README file
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whitespace
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broke Association stuff out of the AttributeAssignment module; refactored long methods; cleaned up tests
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updating readme
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aliasing assignment method
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Commits on Apr 9, 2014

Commits on Apr 10, 2014

Merge branch 'refactor_assign_attributes'
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Commits on Sep 5, 2014