Update global.ent

Replace retired IMAP c-library link with copy on GitHub

Closes GH-12

Author: wenz

entities/global.ent

@@ -186,7 +186,7 @@
 <!ENTITY url.iis.fastcgi.settings "http://learn.iis.net/page.aspx/248/configuring-fastcgi-extension-for-iis-60/">
 <!ENTITY url.imagemagick "http://www.imagemagick.org/">
 <!ENTITY url.imagemagick.usage.transform.function "http://www.imagemagick.org/Usage/transform/#function">
-<!ENTITY url.imap "https://www.washington.edu/imap/">
+<!ENTITY url.imap "https://github.com/uw-imap/imap">
 <!ENTITY url.imap.book "http://oreilly.com/catalog/9780596000127/">
 <!ENTITY url.imode "http://www.nttdocomo.com/services/imode/">
 <!ENTITY url.informix.connectionstring "http://publib.boulder.ibm.com/infocenter/idshelp/v10/topic/com.ibm.odbc.doc/odbc66.htm#sii02998361">