update readme to include more info

* installation instructions
* configuring the port used

Closes #4
add warning about running server inside tmux
Merge branch 'master' of https://github.com/justone/remotecopy

# By Nate Jones
# Via Nate Jones
* 'master' of https://github.com/justone/remotecopy:
  add warning about running server inside tmux
  update readme to include more info