Build oasis
Sandboxes have unique names.

It solves a problem with iframes and webkit when using the back button to navigate.
It also helps to clearly identify a sandbox while debugging.

For the iframe adapter: `sandbox.el.name`
For the web worker adapter: `sandbox.worker.name`
Test web workers only when supported by the browser
Increase testTimeout for Saucelabs
Set tunnelTimeout for Saucelabs to a value that would allow to build PR
Merge pull request #52 from tildeio/unique_sandbox_name

Unique sandbox name