fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

to make the bridge work we need to run an askfirst instance on the ttyS.
additionally add the lua scripts needed to make REST work. this is really ugly
code but it works. i already cleaned up to the original code, but there are still
issues such as a new luci session being created for each request.

Signed-off-by: John Crispin <blogic@openwrt.org>