Fixed bugs:

• Internal bignum to int64_t convertion doesn't consider signness. #138
• (archive) with tar doesn't create proper tar ball. #139
• delete-directory* doesn't delete hidden directory. #140
• terminate-oldest-handler sometimes causes &abandoned-mutex-exception. #141
• socket-select causes SEGV. #142
• Identifier created by datum->syntax is refered incorrectly. #105

Improvements:

• thread-terminate! on Windows is now a bit safer.
• Supporting Unicode 8.0.0
• Better timezone handling.

New features:

• Timer SRFI is supported.
• (sagittarius timezone) has been added.
• with-syntax* has been added to (sagittarius control)