updated sequelize-restful

preventing https://github.com/sequelize/sequelize-restful/issues/16
v1.6.4
updated body-parser (!currently broken dependencies!)
downgraded to frisby 0.7

fixes #81 where frisby's own dependencies clashed with runtime dependencies during test run
back to frisby 0.8

did not fix issue #81!
added direct dependency to request 2.49

fixes #81
Merge pull request #83 from bkimminich/develop

dependency issues fixed