Modified for wheezy.

* Commented out entry to modify apt sources.list... Why???
* Update check to look for 0.2 instead of 0.1.  Someone must of forgotten this.
* Added BASEDIR var to keep track of install location for later
* Added missing change directory after installing metasploit.  This ensures following commands are run from the correct location (before it was trying to do them from /opt/metasploit)
* commented out the memory change on this version - use raspi-config instead!