Source code checked in, #ba8bf459e44aab693d58c6df4a80bb481319e04f

Version 5.4.3: Added support for Visual Studio 2015; changed V8Update to use installed Python 2.x; fixed hangs in V8 proxy finalizers during script execution (Issue #86); fixed V8 weak handle callback context leak (Issue #90); fixed dynamic method invocation with value-typed arguments (Issue #89); improved V8ScriptEngine::Interrupt() latency and reliability; added tests for bug fixes. Tested with V8 4.4.63.29.