API Cleanup for Safe Mode, Versions, etc.

Currently there are some inconsistent ways of doing various things with proxies/blocks etc that should all have a common and consistent API. We should allow them all do use either syntax.

Safe Mode:

person.safely.save

safely do

  person.save

  address.update_attribute(:street, "Forsterstr.")

end

Versioning:

person.versionless.save

versionless do

  person.save

  Agent.create(:name => "007")

end

Timestamping:

{{`}}ruby
person.timeless.save

timeless do
person.save
Account.create(:name => "savings")
end