Fixed bugs:

• Multipart sender for HTTP/2 didn't send data correctly
• Non blocking server of (net server) used only one thread
• Size limited shared priority queue expanded on race condition of removal and addition

Improvements:

• SSE detection on FreeBSD is added (Thanks to Ashish SHUKLA)
• Faster thread creation. (approx. 10 times faster)

New features:

• Sandboxing library (sagittarius sandbox) has been added
• Mocking library (sagittarius mock) has been added
• Monitoring procedures are added to (net server)
• shared-priority-queue-capacity has been added to (util concurrent shared-queue)
• shared-queue->list and shared-priority-queue->list have been added to (util concurrent shared-queue)
• Actor model library (util concurrent actor) has been added
• SRFI-158 has been supported
• Non blocking server now supports socket detaching
• Experimental combinator library (sagittarius combinators) has been added
• Experimental PEG library (peg) has been added

Backward incompatible change:

• Applied the latest errata of SRFI-115 and implementation