Added config files that should not be placed into repos by default as they contain database information and URL's that will vary between local and other servers and can cause conflicts.

ExpressionEngine.gitignore

@@ -8,6 +8,10 @@ images/member_photos/
 images/signature_attachments/
 images/pm_attachments/
 
+# For security do not publish the following files
+system/expressionengine/config/database.php
+system/expressionengine/config/config.php
+
 # Caches
 sized/
 thumbs/