Revert "Rename task-names and destination commands due to rake conflicts"

Solved in a better way in 453b0766457d629ee797f620623ebdd58610eee0.

This reverts commit 0bf571e5ba8666817c2d2a7740305316d9c92e13.
Clear ARGV before initializing Rake

Rake directly inspects ARGV and will crash if it
doesn't recognize a flag that was passed to fez.

Fixes #43