Added Dash and Trash#update_attributes.
Corrected documentation, update_attributes with a bang.
Auto include Dash::IndifferentAccess when Extensions::IndiferentAccess is included in Dash.
Fixed from and transform_with Trash features when IndifferentAccess is included, related to #167.
Merge branch 'master' into more_verbose_in_error

Conflicts:
	CHANGELOG.md