sed might be at /usr/bin/sed instead, stop depending on extended regex.

fixes #31
update to newer fast-export
pass --quiet to fast-export to make error cases more obvious, fixed #34
Merge remote-tracking branch 'offbytwo/master'

* offbytwo/master:
  pass --quiet to fast-export to make error cases more obvious, fixed #34
  update to newer fast-export
  sed might be at /usr/bin/sed instead, stop depending on extended regex.

Conflicts:
	Makefile
	bin/git-hg