Some CLI commans prompt to select an existing application, presending a
dropdown with all the application names, however it's hard to remember
which application belon to which device type, which makes it easier to
select the wrong application.
The last part of `quickstart` feels weird. By consensus, we remove the
part that attempts to create a project directory and leave that step to
the user.
We get a weird error message from pine otherwise:
ResinRequestError: Request error: It is necessary that each app name
that is of a user (Auth), has a Length (Type) that is greater than or
equal to 4.
If the spinner message doesn't fit in your terminal, each spinner
position will be printed in different lines.
We mitigate this by dramatically shortenning the message.
Currently, if `device init` was ran without an application argument, we
attempted to get the application name from the current directory, given
it was a git repository.
This approach led to confusions from time to time, so now we prompt the
user to select one of it's own applications from a dropdown instead of
checking the current directory in this edge case.
Fixes: https://github.com/resin-io/resin-cli/issues/197
