Adding a new test for makeQuiz, and the files associated with it.
Also fixed a bug where the blue math '=' would only allow number comparisons,
while the green logic '=' allowed anything. This makes it so the blue and
green '=' and '!=' behave the same.
Creates yail that follows classic: (any any) for '=' but (number number)
for all other operators.

Change-Id: I4012d73e8889a64bc4bf2dcaeb179f6996f4b18b
Fix for Text_Join_Mutator

Change-Id: I9e919b5e54cb0dfd90034301f2a0d2751b443d28
Point the "Learn" link to App Inventor 2 Specific Information

Change-Id: I219a708a08e616e6c5a4a82d4c061050809e3794