fixes header links on 404 and 500 page
adds admin email address to settings_common
adds fire list block to 404.html template
adds send broken link emails to settings_common
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cleans up 404 template blocks
removes hardcoded URL on 404 and 500 templates
adds 403 template
Merge pull request #47 from SCPR/design_template

Add hooks for 403, 404 and 500 error pages...