Updated README.
Removed XTTest framework from podspec.
Implemented rs_to method.
Implemented downto method.
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Implemented upto method.
Added next method.
Added gcd method.
Added lcm method.
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Fixed times methods.
Updated README
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Formatting.
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Added Travis CI support.
Updated podspec to 0.1.0
Merge branch 'release/0.1.0'