Add 'make install' and 'make uninstall'

Signed-off-by: David Scott <dave.scott@citrix.com>
Update README.md

Signed-off-by: David Scott <dave.scott@citrix.com>
Fix misleading comment

Signed-off-by: David Scott <dave.scott@citrix.com>
Release 0.6.0

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

master is now 0.6.0