v0.17

 - Updated Makefile and README.
 - Requiring the RFC-compliant JSON::Tiny 0.45.
 - Fixed typos and updated POD in Bubblegum, Class, Exception, Role, and
   Singleton.
 - Fixed typos and updated POD in Bubblegum::Syntax; the raise function
   defaults to $@.
 - Fixed string formatting method agrument error.