bghalami-rc

Updated to check subtypes to be compatible with the Ruby on Rails class `ActiveSupport::HashWithIndifferentAccess`, which is a sub-class of `Hash`

There are inconsistencies with how Ruby on Rails and how this gem interpret what is and what isn't a valid `Hash` which trigger the argument error in the [hash_converter.rb](https://github.com/evolve75/RubyTree/blob/0c052cd0abb328c0162110817b2ef36be765c3ac/lib/tree/utils/hash_converter.rb#L109) ```...