default for boolean dummy values not working

for booleans, the following default values in the schema should be recognized as true, anything else is false:

`'1'`, `true` or `1`

i.e. in ReactiveRecord::Base::DummyValue
```ruby
def build_default_value_for_boolean
@column_hash[:default] == '1' || @column_hash[:default] == true || @column_hash[:default] == 1
end
```