We now populate "lasterror" and "lasttrace" object variables, to enable better visibility of errors that may occur while working with the class.
Spring cleaning was performed on some of the files, so that the code is more readable.
Add additional information to the README, reflecting the latest changes and some more information about how to write a Stasis application using PHPARI.
Merge branch 'feature/Proper-Error-Reporting' into develop