add require("./test-setup-all") to test-setup-browser

b/c it wasn't being loaded in an async friendly way

use case: if your remove some of the default required files in test-setup-browser
the async call will take less time and expose the bug. this fixes that

/cc @eastridge
Merge pull request #130 from walmartlabs/test-setup-all-require-statement

add require("./test-setup-all") to test-setup-browser