Honour value of 'disable_updated_at' paramter

Honour value of 'disable_updated_at timestampable behaviour parameter.
Merge pull request #846 from exptom/patch-1

Honour value of Timestampable's "disable_updated_at" parameter in SoftDeleteBehavior
Issue #843: Fixed bug when single inheritance keys contain special characters
Merge pull request #847 from acim/843-single-inheritance-keys-bugfix-squashed

Issue #843: Fixed bug when single inheritance keys contain special chars

Replace #843
Merge remote-tracking branch 'upstream/master'