Enable debugging of a single Jasmine test.

Manually alter the line (change `false` to `true`):

    window.debugJasmineTests = false;

in file:

    common/static/js/vendor/jasmine-debug.js

And all of `it()` tests will be disabled. Then proceed to enable a specific `it()` test by changing `it(` to `_it(`.

PS: Don't forget to change everything back!