.
Added sample and sample(n) method.
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Refactored reverse method.
Added NSArray addition methods.
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Added includes method.
Added fetch method.
Added missing tests for flatten method.
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Tiny refactoring for drop method.
Added delete and deleteAt methods.
Added deleteIf.
Mirrored delete, deleteAt and deleteIf for mutable array.
Refactored tests.
Updated README.
Updated podspec.
Merge branch 'release/0.6.0'