Remove no-longer-used argument to _glfwCreateMonitor
Fixed order of operations bug in gamma test.
Merge pull request #39 from nilium/up-fix-monitors

Remove no-longer-used argument to _glfwCreateMonitor.
Added macros for library initialization check.
Removed platform-specific resources from monitor.
Made glfwGetMonitorPos immediate.
Unified Win32 cursor clip rect setting.
Minor cleanup of Win32 window code.