* Wait until element is clickable before clicking in e2e tests
A new `findClickableElement` has been added to the webdriver to allow
finding an element and blocking until it's both visible and enabled.
This is now used by the pre-existing `clickElement` method as well.
All cases where something is clicked in the e2e tests have been
updated to use one of these methods, to ensure we don't run into
intermittent failures when loading screens take longer than usual.
* Specify type before parameter name
Various JSDoc `@param` entries were specified as `name {type}` rather
than `{type} name`.
A couple of `@return` entries have been given types as well.
* Use JSDoc optional syntax rather than Closure syntax
* Use @returns rather than @return
* Use consistent built-in type capitalization
Primitive types are lower-case, and Object is upper-case.
* Separate param/return description with a dash
The Selenium webdriver is difficult to use, and easy to misuse. To help
use the driver and make it easier to maintain our e2e tests, all driver
interactions are now performed via a `driver` module. This is basically
a wrapper class around the `selenium-webdriver` that exposes only the
methods we want to use directly, along with all of our helper methods.
