Avert warnings: cast malloc retval
Actual confirmed bugfix for VLAN parsing issue.

Originally ngrep only accounted for VLAN offset if it was
specified in the BPF filter.

Prior version 1.46 expanded the BPF filter to include IPv4/6
traffic, regardless of whether or not VLANs were in use -- but
the offset calculation didn't account for the variable presence
of VLAN headers.

This version keeps the inclusive BPF filter, but detects VLAN
frames in every packet and adjusts the offset on the fly.
Version bump for release
Doc updates for version, github issues location
Update VS2012 configuration, builds on Win32 again

- use ws2tcpip.h, packet.lib to get inet_ntop
- removed support/inet_ntop.[ch] -- no longer necessary
- update gitignore to nuke MSFT turds