uProxy alpha release candidate 0.8.2

• Note: this is an API breaking change: 0.8.2 will not work with 0.8.1 or below. The protocol change was needed to work around a bug in Firefox WebRTC (https://bugzilla.mozilla.org/show_bug.cgi?id=929977 - it doesn't notice when the peer disconnected, leaving Firefox in a broken state).
• For Firefox users of v0.7.1: you'll need to delete your old settings for the add-on; and in particular reset the stun-server settings.
• Firefox 37 introduced a regression in the number of data channels it can handle which causes bad things to happen (only support 8 channels to be openned in one direction; this means the first page loads, but quickly proxying speed slows to a standstill)