Sanscript PHP

I ported Sanscript and the test set to PHP. The PHP version supports all schemes and passes all of the tests. Are you interested in merging the PHP version into the main repository?

The only (optional) change I made to sanscript.js was to use array literals in the instance variable initializers instead of dynamically created ones created by split(). This change made the port into PHP more natural and didn't seem to weaken the javascript verison.

Thanks.