Add support for twitters (migth not work!)

Change-Id: I135ec863e457b741432fd59bc170b0ecc8c26718
Reviewed-on: http://gerrit.dmdirc.com/744
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>

src/com/dmdirc/addons/parser_twitter/plugin.config

@@ -42,6 +42,7 @@ defaults:
 
 provides:
   twitter parser
+  twitters parser
 
 exports:
   getParser in com.dmdirc.addons.parser_twitter.TwitterPlugin as getParser