gitignore for custom modules

This gitignore ignores anything in the modules directory while explicitly including modules that ship with simplesamlphp. This allows users to create and maintain custom modules while tracking upstream.

modules/.gitignore

+# Ignore any files or directories in this directory
+/*
+!/.gitignore
+
+# Explicitly include modules that ship with simplesamlphp
+!/adfs/
+!/authcrypt/
+!/authfacebook/
+!/authlinkedin/
+!/authmyspace/
+!/authorize/
+!/authtwitter/
+!/authwindowslive/
+!/authX509/
+!/authYubiKey/
+!/cas/
+!/casserver/
+!/cdc/
+!/consent/
+!/consentAdmin/
+!/core/
+!/cron/
+!/discopower/
+!/exampleattributeserver/
+!/exampleauth/
+!/expirycheck/
+!/ldap/
+!/memcacheMonitor/
+!/metarefresh/
+!/multiauth/
+!/negotiate/
+!/oauth/
+!/portal/
+!/preprodwarning/
+!/radius/
+!/riak/
+!/saml/
+!/sanitycheck/
+!/smartattributes/
+!/sqlauth/
+!/statistics/