Added ability to append a postfix tag to the end of a version.  This is useful for making one-off binary releases to test changes without changing the primary builds.
Enabled PHP cli build and PHP Pear build.  These are packaged into their own downloads and not installed by default.  The php-cgi binary is also moved into it's own download.  It's there, but unlikely to be used.
Changed script to error if no version is set.