Test on OS X inside Travis
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Merge pull request #28 from RoboticCheese/roboticcheese/build-osx-in-travis

Test on OS X inside Travis
Recognize version or version + build
Add prerelease and nightlies resource options
Nail down metadata class except Windows version processing
Map Windows versions => nicknames
Provide method and key access to metadata instances
Provide access to the filename portion of the URL
Implement metadata helper in main provider
Rip out all now-unnecessary sub-provider logic
Fix comment typo
Update CHANGELOG w/ new metadata info