Use <v8.h> as include path for includes of "third_party/v8/include/v8.h", adapt Visual Studio project files to include the required path, move includes in mongo/scripting/v8* into style guide order, build Visual Studio output files for V8 in separate directories so that SpiderMonkey and V8 builds can be run at the same time and to prevent link errors, tell .gitignore to ignore these new directories.