v1.4.0

• feat: realm.raw('SELECT ...') and Model.raw('SELECT ...') (#94)
• feat: support multiple order rules in one single string or one-dimensional array (#92)
• feat: Model.truncate() now uses TRUNCATE if possible
• feat: Model.find().optimizerHints('SET_VAR(foreign_key_checks=OFF)')
• fix: Bone.bulkCreate() should not throw when called with non attribute (#117)
• fix: batch upsert (#108)
• fix: make sure connection is passed around in all queries carried out within transaction (#105)
• fix: update, sequelize mode get API, destroy compitable (#104)
• fix: setDataValue in sequelize adapter should not check prop name strictly
• refactor: spell_insert (#118)
• docs: about egg-orm & migrations (#119)
• docs: revise instructions for installing Jekyll (#111)
• docs: migrations, validations, hooks, and sequelize adapter (#103)
• docs: contributing guides