Create upload_hex.bat

upload_hex.bat is a Windows batch script to flash firmware .hex files to the vehicle interface module.
Switch to next development version and use dev version of python lib.
Drop realpath from upload_hex, require absolute path.

This turned out to be difficult to support cross-platform.

Fixed #176.
Merge branch 'next' into pr/38
Move upload_hex.bat into scripts folder for consistency.
Fix indentation in Windows batch script - needs tabs.
Fix variable syntax in Windows batch file - tested and working in Win7.
Move user-level flashing instructions to chipKIT VI site.
Build all emulator versions into a .zip when releasing.
Take a knife to some of the complicated parts of the docs.
List message defs after installation in docs so python lib is installed.
Fix a rst syntax error.
Rename Ford prototype now that it's released.