Added tests for broken << operator.
First try to fix broken << operator.  Some tests still fail in sqlite, but fixes appear to work
when manually tested in PostgreSQL.  Checking in so I can clone on a CentOS box where PostgreSQL
tests can be run.
Added Travis CI icon for inetdavid/closure_tree fork.
Remove stderr message.  See if I can reduce TravisCI matrix for now till I narrow down the problems.
Ensure order_value is always set if order_is_numeric?.  (With tests.)
Restore remainder of Travis test matrix after passing with Ruby 1.9.3/Rails 3.2 on all databases
Remove link to Travis test icon for inetdavid/closure_tree from README.md
Add tests to confirm two new issues (deletion failures and sort_order issues)
unhide the failures
rebuild now forces sort order on save and on reparenting
preparing 4.4.0
fixed tests
fixed tests
New `self_and_ancestors_ids` method to get self id with ancestor_ids
Mention `self_and_ancestors_ids` in README
added passing tests and self_and_descendant_ids too, for extra credit. Thanks, kirs!
remove irritating stderr message about sleep
make travis run in a different database for every run
added test for remove_prefix_and_suffix
moved foreigner reference to ci gemfiles
Dropped support for rails 3.0. See https://travis-ci.org/mceachen/closure_tree/jobs/18563881