0.7.2

• New Semaphore class based on java.util.concurrent.Semaphore
• New Promise.all? and Promise.any? class methods
• Renamed :overflow_policy on thread pools to :fallback_policy
• Thread pools still accept the :overflow_policy option but display a warning
• Thread pools now implement fallback_policy behavior when not running (rather than universally rejecting tasks)
• Fixed minor set_deref_options constructor bug in Promise class
• Fixed minor require bug in ThreadLocalVar class
• Fixed race condition bug in TimerSet class
• Fixed race condition bug in TimerSet class
• Fixed signal bug in TimerSet#post method
• Numerous non-functional updates to clear warning when running in debug mode
• Fixed more intermittently failing tests
• Tests now run on new Travis build environment
• Multiple documentation updates