remove some wordy lines of code and changed #move_to_root implementation
Prefer 2.0.0/1.9.3 to 1.8.x variants. Require database_cleaner.
Rewrite specs to check inclusion in array rather than absolute equality.
Fix test for JDBC
Merge pull request #176 from yuszuv/refactoring

remove some wordy lines of code and changed #move_to_root implementation
move hardcode id to primary_key
Oracle does not support locks in subquery

Issue #166
using the quoted order column name
Merge pull request #188 from kangguru/master

Quote order_column_name
Merge pull request #186 from superimmo/master

Move hardcode id to primary_key
Merge pull request #187 from jhanggi/oracle_lock_166

Issue #166 Oracle does not support locks in subquery
Fix ordering for left_sibling
Remove left_sibling order clause completely.

This is already handled by siblings via nested_set_scope
Refactor into existing or new methods where possible.
without_self returns scope when not persisted.

Fixes #157
Merge branch 'master' into rails4

Conflicts:
	.travis.yml
	lib/awesome_nested_set/awesome_nested_set.rb
	spec/awesome_nested_set_spec.rb