Revert "Calculator: improve triggers; add 'squared'"

This reverts commit 5e6c1abb9a923d98b8615b206fb1122d9ac2f6bf.

Conflicts:
	t/Calculator.t

@mwmiller Sorry I had to revert--I couldn't deploy it because it was triggering with the query "time." I should've tested it thoroughly first before merging in to master.