Can you bring back `form-input`, `form-select`, etc?

[jeffsawatzky]

Hello, I use emberjs, along with the ember-power-select addon for custom select boxes. Ember-power-select uses a div for the select trigger and not a select element. Previously I was able to style it with tailwind-custom-forms using a form-select class, but now I can't.

Its great that we don't need to add these classes to normal form elements, but sometimes we need to style a non-form element as one, and these classes made it easy.

[zeppelin]

When transitioning from an existing CSS framework to Tailwind, it'd be great if elements were not targeted directly - or at least an option existed to specify classnames to avoid clashes. That would solve the above use-case, and also avoid vendor lock-in to this plugin.

[chasegiunta]

Related to #11

[adamwathan]

Added a new class strategy in v0.3.0 that should handle this, thanks to @chasegiunta 👍