TODO-RELEASE: mention the pending biggies for 7.27.0

To be addressed in 7.24.1

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To be addressed in 7.27

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295 - "RTSP Authentication (#22)" https://github.com/bagder/curl/pull/22

309 - metalink support for the curl tool

296 - "OOM leak in multi code" (by Dan Fandrich)

310 - a new authentication callback

300 - "Polling on stray socket on sequential transfers." Andrew S

      http://curl.haxx.se/mail/lib-2011-07/0053.html

311 - support for SSPI schannel for SSL on windows

308 - Revisit option --enable-threaded-resolver at least allow selection among

      pthreads and Windows threads when building a Windows target.

      http://curl.haxx.se/mail/lib-2012-01/0291.html

309 - 

312 -