Changes to ghc(2)

Changes to ghc:
commit 48abb88b20d1204dfaaf613194ab110fe43f0491
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Thu Jun 19 09:25:59 2014 -0700

    Update documentation to follow 2dc3b476aff28

    Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

commit e47baafadb6394a72b8c01142b54fff4b97c055d
Author: Edward Z. Yang <ezyang@cs.stanford.edu>
Date:   Fri Jun 20 17:19:40 2014 +0100

    More fixes and updates to implementation document

    Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>