Updated .md documentation files and scripts to location in /opt for boot...

...local.sh and profile

The documentation is not confirming the current released version: the bootscripts.sh resides in /opt instead of in /var/lib/boot2docker. The script further checks for bootlocal.sh and profile, for making local modifications, but also does so in the wrong location. I updated the documentation and the script to use /opt.
no. - `/opt/` is where the defaults live, and changes here are lost when you reboot