Added nfswatch binary_hashes
Updated Makefile and version.mk for nfswatch.
Updated .gitignore
Updated nfswatch-modules files

Replicated configuration used in rocksclusters/hpc roll for
rocks-openmpi modules. Modulefile version for <package>-modules is
copied from ../<package>/version.mk. Requires PKGROOT tag to be in
<package>/Makefile and NOT in <package>/version.mk

See...

  https://github.com/rocksclusters/hpc/tree/master/src/rocks-openmpi-modules

...for specific example of source.