Respect element set heading setting on select
Replace \f with &#xc; in OCR output

Form Feed character causes XML validation errors.
add resending user activation emails
Move user activation creation to when the user is added
changed str_replace to preg_replace
Add HTML5 form input and color validation support.
Derivs: Replace "identify" with black/whitelisting.
Allow switchable derivative strategies.

Refactor default ImageMagick code into ExternalImageMagick strategy.
Fix basic tests for new derivative creator.
Remove useless file.
Add Imagick derivative strategy.

Refs #148.
Explicitly free Imagick resources.
Merge pull request #617 from sheepeeh/master

Replace invalid characters in omeka-xml output.
Make "no thumbnails" notices account for other strategies.
Add file thumbnails to edit item form.
Fix handling of images we can't make derivs for.
Add simple default option support.
Fix mimetype leaking between files.

Files uploaded at the same time when validation was disabled would all
share the type of the first file.
Merge branch 'master' into derivatives
a11y: add text labels to pagination control

Also, remove ID on input that caused an invalid page when duplicated.