Add Haskell and Objective-C syntax highlighting to paste

Summary:
Pygments already supports Haskell and Objective-C syntax
highlighting, but the default in Phabricator excluded them from the
dropdown for the paste tool.

This adds Haskell and Objective-C to the default list of languages.

Test Plan:
Started up Phabricator sandbox instance, confirmed Haskell
and Objective-C worked in paste app.

Reviewers: vrana, epriestley

Reviewed By: vrana

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3510

conf/default.conf.php

@@ -1219,10 +1219,12 @@ return array(
     'django' => 'Django Templating',
     'erb' => 'Embedded Ruby/ERB',
     'erlang' => 'Erlang',
+    'haskell' => 'Haskell',
     'html' => 'HTML',
     'java' => 'Java',
     'js' => 'Javascript',
     'mysql' => 'MySQL',
+    'objc' => 'Objective-C',
     'perl' => 'Perl',
     'php' => 'PHP',
     'text' => 'Plain Text',