Exercise 8.5.1 Solved - Adding form_tag, and new test for verifying the remember of type information

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>
Decoupling tests and implementations using RSpec::Matcher

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>
Exercise 8.5.2 solved

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>