Fixing broken finding of page_not_found behaviour.

Note - must(!) be tested after coming out of the airplane...
Merge pull request #503 from wolfcms/page_not_found

Fixing broken finding of page_not_found behaviour.
fix mysql email constraint column name
Fix unwanted suffix in urls archive by month sidebar
Merge pull request #505 from andrewmman/hotfix/mysql_install

fix mysql email constraint column name
Merge pull request #506 from andrewmman/hotfix/archive_sidebar_urls

Fix unwanted suffix in urls archive by month sidebar
Added Observer event view_backend_layout_head.

Allows people to insert code in the HEAD section of the backend.
little formatting and cleanup of Page::findBySlug
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Correct English typo
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