Makefile: 'install' and 'uninstall' are both phony targets

(because they don't create any artifacts whose timestamps are tracked
by make)

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #4 from djs55/portable-osx

Fix build on OS X
Release 0.9.1

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #6 from djs55/release.0.9.1

Release 0.9.1