Roll Die

Created a new page named rollDie.html that generates a random
integer in the range [1, 6] and prints it as an alert.

[close #11]
Lucky Sevens

The Roll Dice page now generates two random numbers and sums them.
The sum is output in an alert.
Using an if clause, there is a special output for rolling lucky 7.

[close #12]
Merge pull request #25 from taylormck/roll-die

Roll die