Fix spec warnings#1583

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axfcampos wants to merge 17 commits intoruby-grape:masterfrom

axfcampos:fix-spec-warnings

Commits on Feb 27, 2017

Enable warnings while running specs
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Fix "warning: instance variable @namespace_description not initialized"
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Fix "warning: instance variable @file not initialized"
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Fix "warning: instance variable @status not initialized"
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Fix "warning: instance variable @excepts not initialized"
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Fix "warning: instance variable @proc not initialized"
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Fix "warning: instance variable @named_params not initialized"
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Fix "warning: instance variable @body not initialized"
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Fix "warning: instance variable @parent not initialized"
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Fix "warning: instance variable @element not initialized"
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Fix "warning: instance variable @group not initialized"
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Fix "warning: instance variable @versions not initialized"
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Fix "warning: instance variable @api not initialized"
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Fix rubocop single quote offense
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Fix rubocop conflict
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Update rubocop todo
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Update Changelog
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