1.51 is the version not 1.5.1. codeload simplifies the Makefile.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

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>

ntripserver developer agency http://igs.bkg.bund.de/ does not reliably provide a source mirror with version naming.

Created a github repository to provide sources and allow contributions.

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>