Ability to submit forms.
Replaced tabs with spaces.
Rearranging code to have all private methods in one group.
Method `getAttribute` of a driver now return `null` only, when attribute is missing.
Merge pull request #32 from aik099/missing-attribute-processing-fix

Stable missing attribute handling
Merge pull request #28 from aik099/form-submit-feat

Ability to submit forms