Adds signing key in the metadata service provider generation.

[tmoiron]

Continue previous PR 275
#275

Made errors while rebasing the previous PR.

So I made another branch with only one commit issued from base master branch.

Hope everything is OK.

[markstos]

Thanks! In the future, another option is to "force push" on the original branch replace the commits on it. I'll get this reviewed.

[cjbarth]

For my own edification, where is the part of the spec that this refers to. I haven't been having any issues with the way things have been working so far, so I want to dig into this a little more.

[tmoiron]

For my own edification, where is the part of the spec that this refers to. I haven't been having any issues with the way things have been working so far, so I want to dig into this a little more.

You may have a look at Metadata for the OASIS Security Assertion Markup Language (SAML) V2.0 page 15 paragraph 2.4.1.1.

You can also browse xsd metadata schema with xsd browser website
md:EntityDescriptor > md:SPSSODescriptor > md:KeyDescriptor > ds:KeyInfo

Hope this will convince you on this modification usefulness