Fixes #164, with test-case, as requested by Julian Berman.#165

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Julian merged 2 commits intopython-jsonschema:masterfrom

ankostis:master

May 6, 2014

Commits on May 5, 2014

Test-case for #164, ValidationError.__unicode__(): use 'is' operator
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Fixes #164, ValidationError.__unicode__(): use 'is' operator instead of
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