exporting mixin schema class information
also export column names and column hash in base model class.
Support getModelClass from Model object

Currently we use __call to dispatch getModelClass method call to
the schema object, so we provide a getModelClass in model to make
sure that we don't call it from __call.
reverse mixin class array so that we can override the mixin method
use timestamp accessor
Bind with static mixin method
Merge branch 'feature/mixin-options'
Checking in changes prior to tagging of version 1.10.0.