Log login-click event

Our logEvent wrapper now returns jQuery.Promise too.

Added timeout out parameter to our logEvent wrapper. Unlike
GettingStarted, I didn't create separate logUnlessTimeout
function.

Chrome apparently emulates enter on links as a click, so
this catches enters, left and middle clicks, but not if
the link is opened via right click menu. Might not catch
enter in all browsers.

Change-Id: I4b0eb56e7c7d6e56f8fd99d536f9b60b94a2e09e
Merge "Log login-click event"