Commands UI assert errors should clearly delineate integers from strings.

[jennifer-shehane]

The ASSERT error (in red background) on the commands UI does not signify whether my value is a string or not. The AssertionError (in yellow background) more clearly defines my error (that the integer 25 does not equal "25").

Example

To reproduce:

it('test', () => {
  expect(25).to.eq('25')
})

[verheyenkoen]

Could this be a first-timers-only issue?