Merge commit 'tor-0.2.3.8-alpha' into debian-merge

* commit 'tor-0.2.3.8-alpha': (83 commits)
  Fix a compile warning on 64bit OS X
  bump to 0.2.3.8-alpha
  add a blurb for 0.2.3.8-alpha
  and rm the old ones
  fold in more changes files
  update the man page for the new AuthDirFastGuarantee value
  raise AuthDirFastGuarantee from 20KB to 100KB
  apparently or_options_t likes being a const in master
  man page entries for AuthDir{Fast,GuardBW}Guarantee
  parameterize bw cutoffs to guarantee Fast and Guard flags
  fold in more changes entries
  further cleanups
  fold in more changes entries
  Changes file for bug4360
  Changes file for bug4521 backports.
  Sockets are unsigned on windows
  Log more loudly on a bad cert from an authority.
  Get rid of an unused parameter warning on win
  changes file for bug4515
  Only call cull_wedged_cpuworkers once every 60 seconds.
  ...