github username and email not overrideable

[oakley808]

Hi.
I think I see a small bug here. Yo reads your github username and email from ~/.gitconfig. But when you attempt to override that during the yo prompts, the values are not properly set in package.json, bower.json, and .yo-rc.json. (the values from .gitconfig are still being used.)

Steps to repeat the issue:

1. Set up a ~/.gitconfig file with a user block with name and email
2. Run yo mjs and for the 3rd question ? What is your GitHub name <email>? enter John Smith <[email protected]>
3. Check the json files listed above for githubName, author, and other properties.

FWIW, yo-rc.json does have the proper appAuthor property.