`revel new` app name new file path

[brendensoares]

Due to the many ways to define the app name and location, it can end in an unexpected result.

For example: revel new $GOPATH/myapp would end up in $GOPATH/src/myapp.

To avoid confusion, we SHOULD either:

• explicitly show the resulting file path of the new app project (based on clever rules of interpretation)
• deny ambiguous values (instead of being clever).

PS - we'll also need to document the rules how values are handled