Extensibility Refactor

• Major internal refactor to make the query object more externally extensible
  • Query state is now stored on this._attributes instead of in a local variable.
  • queryize.fn now contains the prototype of the queryize query object. See lib/mutators.js for the contents.
• Added query.clone() to duplicate a query state inline
• Changed query.deleet() to query.delete()
• Switched to using lodash clone and assign functions instead of local versions.
• Added query.disableBoundParameters and deprecated query.useBoundParameters
• Fixed several V8 optimization killers
• Fixed bugs in query.limit() and query.distinct()
• Fixed edge case in query.where()
• Increased test coverage
• Improved documentation