Merge pull request #75 from planctechnologies/dev

Instance id descriptions
Minimal VirtualBox integration.
Merge branch 'master' of github.com:GNS3/gns3-gui
Prevent users to set the port and VLAN settings to 0 on Ethernet switches.
Fixes issue when spaces are in capture file paths.
Fixes bug with live packet capture on Windows.
Save the currently edited device when clicking on ok and apply in the preferences dialog.
Remove privileged access checks for Dynamips.
Update default Wireshark path.
Fixes issue when adding multiple VirtualBox VMs.
Remove early release dialog.
Fixes live packet capture on Windows.
Bump version to beta1.
Merge branch 'master' into dev