Support AMD and Intel processors with nested vm's

Use a more generic model and optional vmx or svm feature.
Merge pull request #58 from jordant/master

Support AMD and Intel processors with nested vm's
syntax cleanup
Enable parallelization
Use random string in name of domain
Merge pull request #61 from sciurus/0.0.7_parallel

Enable Parallelization
new version and small changes
Requre Nokogiri 1.5
Autostart and activate networks that are not already autostarted or activated
Merge pull request #64 from sciurus/network_activation

Autostart and activate networks that are not already autostarted or activated
Require nokogiri 1.5.10
Merge pull request #63 from sciurus/specify-nokogiri-version

Requre Nokogiri 1.5
version 0.0.9
Delete files from destination to avoid confusions