Option for accepting one or more issue files on the CLI

[karlcow]

in issue #14, we discuss the possibility of sending issues in a batch to webcompat.com site, but to avoid disaster to have a safeguard. Then if we put a safeguard and the input is a list of files, we do not want to annoy the user with yes for each file. So we need to buffer the Yes answer and go on with the list of files.