Fixed bugs:

• R7RS syntax-rules didn't escape ellipsis.
• Issue #242: C Assertion of code builder

New features:

• (rsa pkcs :12) supports pbeWithSHAAnd2-KeyTripleDES-CBC
• SRFI-152 is supported
• SRFI-156 is supported
• YAML parser/writer library (text yaml) has been added.
• JSON Schema (draft 7) library (text json schema) has been added.
• JSON validation framework library (text json validator) has been added.
• (text toml) supports version 0.5.0
• URI resource access library (util uri) has been added (not documented)