add new `color-base` dependency

`dom-style` requires `color-base` as of d2245af
use a variable for the `wait()` timeout
remove delay from automatic purge test

The delay doesn't add much value in addition to what we're trying to test.
remove delay from the insertBefore node
simplify with default timeout
set a generous transaction timeout for browsers that don't fire an event when css fails to load
configure a robust CSS timeout only for load tests
use loader to load required modules for `coverage.html` and `load.html`

We manually list out all module dependencies in `get.html` to avoid
relying on `get` to test `get`. Since any issues arising from using
`get` to test `get` will be circumvented there, we can rely on `get` to
bootstrap the coverage and load tests. This will reduce the overhead of
keeping dependencies in sync across multiple files.
use default timeout of 10 seconds
focus only on basic js tests when load testing

Keep the complexity/readability/maintainability of the Get tests low
while still benefitting from some load testing.
add timeout for any tests involving 3 or more javascript assets