include LICENSE file in rack-openid

[ktdreyer]

Thank you very much for your work on rack-openid. I'm working on packaging this gem for Fedora, and the Fedora Packaging Guidelines suggest that I ask you to include the LICENSE file in the gem that ships from rubygems.org. It's great that this file is already in Git. By including a copy of the exact MIT license text in the gem as well, you will make the terms of the rack-openid license very clear.

Also, in the specific case of rack-openid's MIT license, all derivative copies of rack-openid are required to contain the disclaimer text within the MIT license (as described in the sentence "The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.") So in order to ease development and distribution of rack-openid, it makes sense to simply include this text in the upstream project.

More details about this can be found on Fedora's wiki, under the "License Text" section: https://fedoraproject.org/wiki/Packaging:LicensingGuidelines#License_Text

Would you mind adding the LICENSE file to the gemspec and shipping it as part of the gem?