1..5
# ->getPluginVersions()
ok 1 - ->getPluginVersions() returns an array of stable versions for a plugin
ok 2 - ->getPluginVersions() accepts stability as a second parameter and returns an array of versions for a plugin based on stability
ok 3 - ->getPluginVersions() accepts stability as a second parameter and returns an array of versions for a plugin based on stability cascade (beta includes stable)
# ->getPluginDependencies()
ok 4 - ->getPluginDependencies() returns an array of dependencies
# ->getPluginDownloadURL()
ok 5 - ->getPluginDownloadURL() returns a plugin URL
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