Update is_required to missing_required_property
Updates to selenium and travis

Bump selenium for Firefox 28 support.
Add wait in User Preferences test to reduce failure.
Split out travis tasks further for faster build time per job.
Add selenium tests for public interface search

Tests for basic and advanced search including the use of the
boolean operators.
Bugfix: Become user would throw an exception in the frontend.

Added a Selenium test to exercise this functionality, and a bonus little
utility function to give you a REPL when writing/debugging Selenium
tests.
Fix exception when visiting an accession detail view in the public app when the accession does not have a title.
Merge pull request #54 from mark-cooper/travis_selenium_updates

Updates to selenium and travis
Merge pull request #56 from mark-cooper/public_search_tests

Add selenium tests for public interface search
Merge pull request #57 from mark-cooper/rights_statement_validations

Update is_required to missing_required_property
Merge pull request #58 from marktriggs/become-user-fix

Bugfix: Become user would throw an exception in the frontend.
Merge pull request #60 from payten/fix-accession-public-view

Fix exception when visiting accession in public app