Vagrant plugin update

Convert Vagrantfile format to V2, add CPU, RAM, IP support.

Details:
- Vagrantfile; from v1 to v2 - Vagrant is new and V2 is available - pushing forward to the latest version; Note - file format is incompatible with V1...
- CPU count; 1 by default, can be raised to max number of CPU core available on the underlying box
- RAM; changed --memory to --ram, it was not working yet, it now is; in MB
- IP; can specify a "start" IP for the internal network, not hardcoded anymore; IP is incremented by 1 for each new VM if --count > 1