New adopter fix

Hi Leo,
this patch simplifies the URL verification. This makes it hopefully possible to use Matterhorn2Go with Matterhorn installations which are only reachable via HTTPS and with Matterhorn installations which are hooked into a regular webserver in a way that they are reachable via a subpath [http://example.com/path/to/matterhorn/<services>].

It's untested as I have no installed Flex but the changes are simple enough so that they sould hopefully work out of the box :-)

Take them or reject them as you wish.
Lars