Removed Deprecated -r Option

Removed -r option, which was deprecated by the original developer quite some time ago.
Updated README

Cleaned up the README and added information about the -g option.
Clarified Use of the -g Option

Clarified the use of the -g option in the check_ports help message to state that it only needs to be specified on FreeBSD <= 9.x and is implicit on FreeBSD >= 10.x
Added CHANGELOG Notes; Changed Version Numbers and Project URL

Added notes in the CHANGELOG in preparation for a v0.7 release. Also changed version numbers and project URL in the script and in the CHANGELOG.