Fixed bugs:

• Issue #232: R7RS mode syntax-rules literal problem
• (peg) had unbound variable
• $or in (peg) caused infinite loop

Improvements:

• Compiler checks arguments count of calling procedure if possible.

New features:

• JSON pointer library (rfc json-pointer) has been added
• make-hashtable-serializer has been added to (text json object-builder)

Backward incompatible change:

• valid-sre? in (srfi :155) now return boolean value instead of SRE