1.6.7: Segfault Fix, More Safety Checks, Windows Fixes

• Fixed a MSVC parser stack overflow when parsing regionName.c and
  timeZone.c. Fix by elliotlo. GitHub #64.
• Updated region codes and timezones.
• When using GEOIP_MEMORY_CACHE with an invalid database file, the search
  tree traversal could attempt to read memory outside of the memory allocated
  for the memory cache, resulting in a segmentation fault. A check was added
  to ensure that the traversal code does not try to read beyond the end of the
  file, whether in memory, memory mapped, or on disk.
• Previously the return values from file reads were ignored. We now check
  these values to ensure that there were no errors.