failure sending webmentions from mention-tech

[kevinmarks]

go to http://mention-tech.appspot.com
and put 'http://mention-tech.appspot.com/' in source and 'http://kevinmarks.com/' in target

It verifies the webmention, then calls
'https://webmention.herokuapp.com/api/webmention?source=http%3A%2F%2Fmention-tech.appspot.com%2F&target=http%3A%2F%2Fkevinmarks.com%2F'

and gets '400' {"error":true,"message":"You need to specify both a "source" and a "target" URL"}

[voxpelli]

This is because the params should be sent in the body of the POST request, see validation at https://github.com/voxpelli/webpage-webmentions/blob/master/lib/routes/api.js#L429, but let's leave this open to add support for query params as well – no reason they can't be just as accepted, right?