fix script names + detect if the VEID to backup doesn't exist
allow to compress backups with gunzip or xz
support gz/xz archives when restoring
fix gzip compression
bzip2 support
remove compression TODO -> implemented
README changed to include compression param
Merge branch 'master' of https://github.com/Rackster/vzpbackup into Rackster-master

Conflicts:
	vzpbackup.sh
	vzprestore.sh