Merge remote-tracking branch 'tjdett/fix-empty-collection-handling' into HEAD

* tjdett/fix-empty-collection-handling:
  Replacing obsolete time.succ with time + 1.
  Fixing Ruby 1.8 date handling for activerecord provider.
  Adding test to ensure empty collections behave correctly.
  Fixing activerecord tests, and adding them as default.
  Fixing tests for Ruby 1.8
  Fixing libxml functionality and enabling its tests.
  Fixing failing "test_xml_error"
  Adding Travis CI config.

Author: cbeer