Fix #77; make Errors have indifferent access
Inline symbolization
Move symbolization closer to where it matters
Use symbol as key
Revert "Inline symbolization"

This reverts commit ccca8e57ba361af6044d67e2d65e3eb179b1f91e.
Add test for ccca8e5 regression
Be more direct in tests
Merge branch 'master' into indifferent-access

Conflicts:
	spec/active_interaction/errors_spec.rb
Merge branch 'indifferent-access'

Conflicts:
	lib/active_interaction/base.rb