[Feature request] Optionally add username prefix to outgoing messages from Matrix to Skype

[MurzNN]

We use matrix-puppet-skype as bridge for talk from multiple Matrix users to Skype room. So we can invite many users in Matrix room, bridged to Skype, and talk.
But now all messages from Matrix room are sent to Skype from one login (configured in puppet), so Skype users don't see original author.
For solve this problem will be good to have an option in bridge for auto add prefix with Matrix username to outgoing message text from Matrix room to Skype.

[MurzNN]

Seems this feature must be implemented on matrix-puppet-bridge server too, so I create matrix-hacks/matrix-puppet-bridge#29