Support for OSX in kmsn / kmsp.
No longer using 'readlink' (we don't actually care whether the directory
containing the script is a symlink or not).
Readability cleanup in the 'usage' line to make it more GNU/BSD style.
Removed dependency on proc for testing if a PID exists, instead using
"kill -0" in kmsp.
updating README
platform-independent process existence check
Merge branch 'master' of https://github.com/alanfranz/killmesoftly into jdaigle_osx

Conflicts:
	kmsn
	kmsp
Fixed: invocation broken when kmsn/kmsp symlinked somewhere, on OSX.
Merge pull request #1 from jpdaigle/jdaigle_osx

Support OSX and remove direct dependency on /proc filesystem on Linux.