refactor(tests): add match_content_of helper that wrap dom expressions
test($core): add tests for basic inputs and actions helpers results
chore(tests): change Capybara default visibility setting
feat($core): add first implementation of per type partial lookup

Each input type can be mapped to a partial in the current
selected theme. The theme is set through `AwesomeForm.theme`. The theme
name correspond to a folder name in `app/views/awesome_form` that
contains the theme partials.