Update README.md

Added .run() because getJoins() returns a query object not a promise to chain
Merge pull request #135 from dulichan/master

Add missing `run` in README.md - PR by @dulichan
Make sure that dates are coerced in the database
Throw a human readable error in case the primary key is not defined for a saved document
Save shouldn't remove foreign keys - Fix #134
Remove test.js from the repo
Make the test ~6 times faster by re-using tables
Update roadmap + contributors
Reduce timeout for tests
deleteAll follows doc, not models -- Fix #136
s/modelToSave/docToSave
Do not save field ignored with 'enforce_extra: remove'
Start #141 -- So far ~33% faster
Refactor hooks
Split util in util/schema
Improve performance for validate/new
Split _save in multiple functions
Less copy, and remove one level in validate
Avoid extra copy when creating documents
Use nodeify in deleteHook