Read-only form element.

Allows for parts of a form to be populated from an XML Form.
Merge pull request #70 from adam-vessey/7.x

Read-only form elements.
Changed for removed permission from islandora.
Merge pull request #71 from nigelgbanks/7.x-permissions

Changed for removed permission from islandora.
Prevents rendering elements that have empty markup.
Fix the comment.
Fix the comment.
Merge pull request #72 from jordandukart/7.x

Prevents rendering elements that have empty markup.