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
doc update [skip ci]
ruby 2.1.2 and no rails 3.0.
ruby 2.1.2 and no rails 3.0.
added test from https://github.com/mceachen/closure_tree/issues/87
Merge branch 'rails-updates' into issue87
Merge branch 'master' into no_nil_order_values

Conflicts:
	CHANGELOG.md
	lib/closure_tree/version.rb
	spec/parallel_spec.rb