RAA - breakpoint

Simple breakpoint-client and debugging-server in 3.5KB.

This is how to remotely debug your code:

1. run debugserver on a console
2. require 'breakpoint.rb' library
3. place breakpoint() method wherever in your code
4. run your program; when it comes to the breakpoint(), 
   it will connect to the debugserver
5. debugserver is console like irb: you can write
   expressions there as if you are at the same place 
   as the breakpoint()