fix(ngMock): fix isSpecRunning to work for Mocha

When running inside Mocha, don't look in Jasmine's spec.queue.running.
It's not there. This is documented as issue #1467; I think this issue was
also responsible for #1589 and recent complaints in #1253.

Closes #1467.
docs(ngMock): remove Jasmine-only comments now that Mocha works

Remove comments about angular.mock.inject and angular.mock.module
being available for jasmine only. Since 1.1.1 the intent is that
they be available for mocha as well; now they even work!
docs(ngMock): fix minor typo in comment

Change "constroctor" to "constructor".