Implemented WebFinger and replaced our XRD with PEAR XML_XRD
New plugins: * LRDD LRDD implements client-side RFC6415 and RFC7033 resource descriptor discovery procedures. I.e. LRDD, host-meta and WebFinger stuff. OStatus and OpenID now depend on the LRDD plugin (XML_XRD). * WebFinger This plugin implements the server-side of RFC6415 and RFC7033. Note: WebFinger technically doesn't handle XRD, but we serve both that and JRD (JSON Resource Descriptor), depending on Accept header and one ugly hack to check for old StatusNet installations. WebFinger depends on LRDD. We might make this even prettier by using Net_WebFinger, but it is not currently RFC7033 compliant (no /.well-known/webfinger resource GETs). Disabling the WebFinger plugin would effectively render your site non- federated (which might be desired on a private site). Disabling the LRDD plugin would make your site unable to do modern web URI lookups (making life just a little bit harder).
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