Bug 730707: First batch of bug fixes

[lmorchard]

• Switch back to out-of-box <% %> EJS escape sequences instead of {% %},
  since the ACE editor interferes with that less and the EJS docs make
  more sense that way.

  • TODO: Maybe need a schematic migration to convert existing templates
    in dev boxes at least:

    update wiki_document
    set html=replace(replace(html, '{%', '<%'), '%}', '%>')
    where slug like '%Template:%';

    update wiki_revision
    set content=replace(replace(content, '{%', '<%'), '%}', '%>')
    where slug like '%Template:%';

• Don't process views of Template:* pages through KumaScript
• Don't apply Bleach to Template:* source
• Reduce required length of page title to 2, so "en" and "CSS" can be
  edited.
• Whitelist a few more elements used in pages for Bleach.
• Add more elements with style attribute allowed by Bleach, whitelist a
  bunch of inline styles used in existing pages.
• Improvements to kumascript error display, broken out into an include.
  Includes edit / new links for Template documents behind scripts.
• Enable plain-text syntax highlighter brush
• KumaScript update