Xdebug edits

[cmosguy]

Here are some basic edits to enable xdebug debugging.

Key takeaway for Windows 7 users running boot2docker should do the following:

1. In the boot2docker VM, run the command: export XDEBUG_HOST=192.168.99.1; ./develop up -d

2. Remember for Windows 7 users, you need to find the correct network bridge adapter. When you start the boot2docker enviornment you will see:

                        ##         .
                  ## ## ##        ==
               ## ## ## ## ##    ===
           /"""""""""""""""""\___/ ===
      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
           \______ o           __/
             \    \         __/
              \____\_______/

docker is configured to use the default machine with IP 192.168.99.100

Therefore, your IP address will be 192.168.99.1