Adding edges() and iteredges() Functions for DAWGs#1

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Commits on Apr 13, 2015

Commits on Apr 14, 2015

adding terminal indicators on edges; adding edge values for IntCompletionDawgs; adding tests for all
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adding tests for larger values to intdawg and intcompletiondawg; replacing dev data for those
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Commits on Apr 16, 2015

edges and iter_edges always return boolean terminal; adding edges_data and iteredges_data for appropriate dawgs; adding tests for new methods
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forgot to add one test in last commit
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adding tests for RecordDawg edges_data() and edgesiter_data()
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Commits on Apr 20, 2015

Commits on Apr 27, 2015

adding unicode tests; starting to fix multibyte unicode issues
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