Adding support for `option` selected state checking.
Ability to submit forms.
Return actual attribute value and not `false` due bug in `kriswallsmith/buzz` composer dependency.

Fixes #11.
Method `wait` was returning `true` and `false` as string instead of booleans.
Merge pull request #13 from aik099/wait-method-return-boolean-value-fix

Fixing incorrect `wait` method return value type
Merge pull request #12 from aik099/empty-attribute-value-fix

Return actual attribute value where needed.
Merge pull request #10 from aik099/form-submit-feat

Ability to submit forms
Merge pull request #9 from aik099/driver-is-selected-feat

Adding support for `option` selected state checking via new `isSelected` method of a driver