execFileSyncAndLog failing on typings install

[jessetrinity]

The new use of execFileSync does not appear to handle the quote wrapping done in typingsInstaller. This is causing ATA in Visual Studio to fail with the following error:

Exec: "C:\Program Files\nodejs\npm.cmd" install --ignore-scripts @types/knockout@ts3.4 --save-dev --user-agent="typesInstaller/3.4.0-dev"
Unhandled exception: TypeError: Cannot read property 'replace' of null at TypeError: Cannot read property 'replace' of null