Fix tab element styling with CSS aggregation enabled

Use of Drupal 6 syntax for drupal_add_css() was causing issues.
Made to use the Drupal 7 syntax properly seems to have cleared it up.
Merge pull request #63 from adam-vessey/7.x

Fix tab element styling with CSS aggregation enabled
Fix DB update

Was previously making the assumption that islandora_content_model_forms
was installed.
Merge pull request #64 from adam-vessey/7.x-fix-update

Fix DB update
Account for adding of existing association IDs...

... By making it get a new one.
Merge pull request #65 from adam-vessey/7.x

Account for adding of existing association IDs...
Changed FEDORA_VIEW to FEDORA_VIEW_DATASTREAMS