Release v2.2.3

This version includes the following changes:

• Adds "paused" status for archives (#119)
• Adds offset and count limits to \OpenTok\OpenTok::listArchives() (#43)
• Adds an \OpenTok\Archive::toArray() method (#74)
• Fixes semantics of \OpenTok\Archive::toJSON() method (#73)
• Windows compatibility fixes:
• Uses forked package aoberoi/json-works (#118, #117)
• Adds run-demo.bat files for samples (#81)
• Enhances run-demo scripts in samples to clean cache directory, fixes syntax (#70, #68)
• Improves phar build (#97)
• Adds HHVM and PHP 5.6 support (#107, #106)
• Correction for documentation of \OpenTok\OpenTok::createSession() (#116)
• Fixes support links (#111)
• Updates composer
• Updates development guidelines (DEVELOPING.md)