Merge branch 'ew/instaweb'

* ew/instaweb:
  instaweb: fix unportable ';' usage in sed
  Makefile: replace ugly and unportable sed invocation
  Add git-instaweb, instantly browse the working repo with gitweb
  gitweb: Declare global variables with "our"
  gitweb: Enable tree (directory) history display
  gitweb: optimize per-file history generation

diff --cc Makefile
Simple merge