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Server Error 500 in Wiki if lexer not found

Created by: Philzen

Just copied some example JSON into a gitlab wiki, preceding it by:

```Javascript

After saving it (which production.log tells me went OK), trying to display the wiki entry is futile always giving error 500. The log traceback is as follows:

ActionView::Template::Error (Traceback (most recent call last):
  File "/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/pygments.rb-0.3.1/lib/pygments/mentos.py", line 303, in start
    res = self.get_data(method, lexer, args, kwargs, text)
  File "/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/pygments.rb-0.3.1/lib/pygments/mentos.py", line 171, in get_data
    res = self.highlight_text(text, lexer, formatter_name, args, _convert_keys(opts))
  File "/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/pygments.rb-0.3.1/lib/pygments/mentos.py", line 122, in highlight_text
    lexer = self.return_lexer(lexer, args, kwargs, code)
  File "/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/pygments.rb-0.3.1/lib/pygments/mentos.py", line 79, in return_lexer
    return lexers.get_lexer_by_name(lexer, **inputs)
  File "/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/pygments.rb-0.3.1/vendor/pygments-main/pygments/lexers/__init__.py", line 80, in get_lexer_by_name
    raise ClassNotFound('no lexer for alias %r found' % _alias)
ClassNotFound: no lexer for alias 'Javascript' found
):
    13: .file_holder
    14:   .file_content.wiki
    15:     = preserve do
    16:       = markdown @wiki.content
    17: 
    18: %p.time Last edited by #{@wiki.user.name}, #{time_ago_in_words @wiki.created_at} ago
    19: - if can? current_user, :admin_wiki, @project
  lib/redcarpet/render/gitlab_html.rb:14:in `block_code'
  app/helpers/gitlab_markdown_helper.rb:44:in `render'
  app/helpers/gitlab_markdown_helper.rb:44:in `markdown'
  app/views/wikis/show.html.haml:16:in `block in _app_views_wikis_show_html_haml__2973566385151022826_36987160'
  app/views/wikis/show.html.haml:15:in `_app_views_wikis_show_html_haml__2973566385151022826_36987160'
  app/controllers/wikis_controller.rb:20:in `show'

Running gitlab 3.0.3 on a gentoo server. All Gems are up-to-date.