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.
bump sqlbuilder version
Add index attribute to declare column
Add index support for pgsql
Fix for index name
Support index
Separate Table SQL and Index SQL
Refactor index builder and fix tests
Fix class use
Fix BaseBuilder for "BuildForeignKeysSQL"
Checking in changes prior to tagging of version 1.10.1.
Changelogs
Fix method dispatching