Log Message:
Update to 1.2.1:

Serf 1.2.1 [2013-06-03, from /tags/1.2.1]
  Fix issue 95: add gssapi switches to configure (r1864, r1900)
  Fix issue 97: skip mmap bucket if APR_HAS_MMAP is undefined (r1877)
  Fix issue 100: building against an old Windows Platform SDK (r1881)
  Fix issue 102: digest authentication failures (r1885)
  Improve error return values in SSPI authentication (r1804)
  Ensure serf-1.pc is constructed by serfmake (r1865)
  Optimize SPNego authentication processing (r1868)
  Reject certs that application does not like (r1794)
  Fix possible endless loop in serf_linebuf_fetch() (r1816)
  Windows build: dereference INTDIR in serf.mak (r1882)

Serf 1.2.0 [2013-02-22, from /tags/1.2.0, r1726]
  Fixed issue 94: Serf can enter an infinite loop when server aborts conn.
  Fixed issue 91: Serf doesn't handle an incoming 408 Timeout Request
  Fixed issue 80: Serf is not handling Negotiate authentication correctly
  Fixed issue 77: Endless loop if server doesn't accept Negotiate authn
  Fixed issue 93: cleanup-after-fork interferes with parent (r1714)
  Fixed most of issue 89: Support REAL SPNEGO authentication
  Enable Negotiate/Kerberos support for proxy servers.
  Return error when C-L, chunked, gzip encoded response bodies where
    truncated (due to aborted connection) (r1688)
  Add a logging mechanism that can be enabled at compile-time.
  Don't lookup server address if a proxy was configured. (r1706)
  Fix an off-by-one in buffer sizing (r1695)
  Disable SSL compression by default + API to enable it (r1692)
  New serf_connection_get_latency() for estimated network latency (r1689)
  New error code and RFC compliance for the HTTPS tunnel (r1701, r1644)
  Handle EINTR when a user suspends and then backgrounds the app (r1708)
  Minor fixes and test suite improvements.