Add a check for name != type of string for wbt-ts-browser

[gauntface]

If you don't add a name but use the object for the ts->browser module, it won't error until it can't use config.src. This can be avoided by checking the name is valid in the browser function.

tsBrowser.gulpBuild({}) => Should throw because it should be tsBrowser.gulpBuild('libName', {})