Test page was created to be accessed by Se Nodes

Now when tests start, they start embedded server as well to show a test page
Se nodes are going to access. In this way we can test complex things like
native events because we can put anything we want on this page.

As for now tests check:
 - whether an element can be found on the page
 - Native Events (drag'n'drop) - fixes #1
 - Executing JavaSript by WebDriver
 - access to external resources from the Internet like JS, Images, etc.