Merge pull request #51 from obiba/drupal-upgrade

Drupal 7.31
Merge pull request #52 from obiba/variable-search-result

MICASERVER-77 Variable search result provides variable/study/dataset lab...
Merge pull request #53 from obiba/search-links

Search links
Merge pull request #55 from obiba/variables-in-study-page

Variables in study page
Merge pull request #56 from obiba/variable-search-links

MICASERVER-77 Link to search variables added in datasets pages
Merge pull request #57 from obiba/various-code-and-style-fixes

Code cleaning
Code amd style cleaning