Version 0.1.2

• Used fork of treebitmap, that allows to implement new
  methods and fixes bugs.
• Added new methods for IpNetworkTable:
  • matches
  • matches_ipv4
  • matches_ipv6
  • matches_mut
  • matches_mut_ipv4
  • matches_mut_ipv6
  • longest_match_mut
  • exact_match_mut
  • retain
  • iter_ivp4
  • iter_ivp6
  • iter_mut
  • is_empty
• IpNetworkTable now implements std::default::Default trait