Added support for multiple shot types, shot types are organized in the shottype.js module
Fix merge conflicts
Added target description
Merge pull request #16 from breaks/master

Added support for multiple shot types, shot types are organized in the s...
fix initial infections, allow data: urls for background images, switch to single shot for now
make users who join a round in progress automatically infected
quick fix for bullet ids, todo: config object
Added support for running behind a reverse proxy

If set also tries to bind to the port got from the PORT env variable