Merge pull request #84 from miguelaferreira/prepare-release-1.1.0

• Allow setting VM private IP in config (PR #73)
• Fix several coding style issues (PR #76, #77, #78)
• Fix bug when destroying VM created with Static NAT and firewall rules (PR #81)
• Allow expunging VM on destroy (PR #75)
• Make network_type optional, and defaulting to "Basic" (PR #82)