Summary: Use WinDbg API StackWalk64()
Reviewed-by: zgu, dholmes

Summary: Added JRE/JDK bin directories to decoder's symbol search path
Reviewed-by: dcubed, sla

Summary: Update copyright year to 2012 for relevant files
Reviewed-by: dholmes, coleenp

Summary: Implementation of decoder for Apple's MacOSX. The implementation is based on the patch provided by Kevin Walls.
Reviewed-by: coleenp, kamg, kevinw

Summary: Code cleanup and creating a private decoder for error handler, since it can be triggered from in signal handler, where no lock can be taken
Reviewed-by: dholmes, kamg, acorn, coleenp

Summary: Made decoder thread-safe
Reviewed-by: coleenp, kamg