Merge pull request #2565 from theallegedjosh/master

ruby-gems aliases

plugins/gem/gem.plugin.zsh

+alias gemb="gem build *.gemspec"
+alias gemp="gem push *.gem"
+
+# gemy GEM 0.0.0 = gem yank GEM -v 0.0.0
+function gemy {
+	gem yank $1 -v $2
+}
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