adjust travisci each environment of ruby or activerecord
support rspec3.0 or later
support activerecord 4.0 or later
Merge pull request #9 from yusabana/support_activerecord4.0_over

Support activerecord4.0 over
Merge branch 'master' of github.com:alfa-jpn/kakurenbo into bugfix/sql_table

Conflicts:
	lib/kakurenbo/mixin_ar_base.rb