[fix] Input, reset_value
Input, label position

* Fixed positioning label left or right of input
* Fixed inputs' id attribute dealing
Validation, multiple values
Input, fire form change

* Input fires form change event on change
Checkbox, don't allow no value

* Checkbox value is default to true
Form, get_data, change

* Form has on_change event that fires on every input value change
* Added get_data method that returns all text-typed input values
[fix] Tests
Version bump