Rails 5

Update travis for rails 5

Fixed README for rails 5.

Typo

Rails RC1 and Minor Ruby Bumps for Testing

This is where JRuby becomes 2.3 compatible.

Update rails version in description

Update repo name in README

Add scope without_deleted

Callbacks are countable, use several instead of few to reference them

Add a without_deleted scope to manually exclude paranoia-deleted records, which is essentially the paranoia_scope.
Useful when using the option :without_default_scope or the unscoping of a paranoia-model was required.
Aliased it to the paranoia_scope as opposed to the existing with_deleted scope.

Rails 5 Support, Require ruby 2.0

Just for consitency. alias_method is easier to reason about than
only_deleted.

Also updates ruby versions

In rails 4.x this passed around a set of arel conditions, in rails 5 it
passes around an AR::Relation and uses where().

See rails/rails@5f521cbff3c8a46cfc8e16b234294a20c285d00d

It is unnecessary to test the AR internals here. Testing the
where_values_hash should be sufficient.