Release initial version of nuxeo-elements

Nuxeo elements should be "cleaned up", tagged and projects should be updated to reference the released version.

After release, update bower.json files to remove non fixed versions (based on branches, with ^ and ~ for following modules:

• nuxeo-platform-webapp
• nuxeo-travel-expenses
• nuxeo-review-workflows-dashboards
• nuxeo-dataviz-elements
• nuxeo-salesforce (if released?)