Add option to omit empty fields.

... Still have to make it omit them...
Merge branch '7.x' of github.com:discoverygarden/islandora_solr_metadata into 7.x-UMKC-7
Prevent the "add" fieldset from displaying when there are no models to add.
Implement the omission, based on our checkbox value.
Coding standards.
Unset reference left over from foreach loop...

... 'Cause PHP is silly.
Preprocess functions rename and documentation.

Changed the preprocess implementations to be prefixed with "template"
instead of the module name. See the second entry here: https://api.drupal.org/api/drupal/includes!theme.inc/function/theme/7#sub_preprocess_templates
Additionally, updated the comments for the preprocess functions as per the
standards: https://drupal.org/node/1354#themepreprocess
Biggish refactor to make querying consistent.

Also, little fix to the template for when multiple descriptions
are being combined.
Merge pull request #13 from adam-vessey/7.x-UMKC-7

UMKC-7