Fix to virt-sysprep command

Swapped 'virt-sysprep -a' for 'virt-sysprep -d' in step 4.
Tidied up step 4
Tidied up image filenames
Create centos6x-i386-vm-gpt-selinux.cfg
Nicola: update kickstart configuration and cleanup script
Nicola: add virt-install usage example
Changed default password

Swapped the default password back to the original to save confusion.
Corrected start date.
Update README.md

Replacing more references to CentOS 6.3 with CentOS 6.x
Increased size of root partition from 4GB to 20GB
Update README.md
Nicola: update usage notes
Nicola: change default password
Nicola: update usage notes
Nicola: a new example was added
Nicola: project refactoring - new documetnation - new script
Nicola: add new files
Nicola: a script to resize VM images was added.
add resizevm.sh script
Nicola: new detailed instructions and minor fixes.