REF: Use Windows thread API for INtime RTOS support

INtime offer support for Win32 API via iwin32. Do not need to implement both Windows and INtime thread support.

Conflicts:
	src/jsonrpc/connectors/threads.h
FIX: Delete Connection thread handle when closing connection
Merge pull request #59 from bcachet/develop

REM: INtime thread API support + FIX: Thread not closed