Merge pull request #1 from leetobin/master

add license text to readme.txt
Hi Lee,

In order to make our project true open-source under a certain license we need to add in the header of each source-file the following header:
/*   
 *   FIREBrick - Software for Forensic Disk Imager & Write Blocker
 *   Copyright (C) 2013  Digital Forensics Investigation Research Laboratory
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

The problem is that not all of the files are written by yourself and I am not sure which of them should include this header and which not. Could you please go through the files and add the header to those you know we have the copyright?