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>

Old keplerproject.org urls are all down.
github project source for this project references new githubio website.

Signed-off-by: Karl Palsson <karlp@etactica.com>

Signed-off-by: Nicolas Thill <nico@openwrt.org>

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

- update source URL
 - simplify build rules
 - add license info
 - add myself as maintainer

Signed-off-by: Nicolas Thill <nico@openwrt.org>