Added RELEASING notes for documentation on how to push new versions to rubygems

RELEASING

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+Releasing ShopifyAPI
+
+1. Check the Semantic Versioning page for info on how to version the new release: http://semver.org
+2. Update the version of ShopifyAPI in VERSION and in shopify_api.gemspec
+3. Add a CHANGELOG entry for the new release with the date (also include the updated date in shopify_api.gemspec)
+4. Commit the changes with a commit message like "Packaging for release X.Y.Z"
+5. Tag the release with the version (Leave REV blank for HEAD or provide a SHA)
+  $ git tag vX.Y.Z REV
+6. Push out the changes
+  $ git push
+7. Push out the tags
+  $ git push --tags
+8. Build the new .gem from the updated .gemspec
+  $ gem build shopify_api-X.Y.Z.gemspec
+9. Publish the Gem to gemcutter
+  $ gem push shopify_api-X.Y.Z.gem