Always pass the auth token when listing all gists

[lucasrangit]

Always pass the authentication token when listing gists. It is needed even when listing public gists on GHE. Moreover, bin/gist enforces the presence of the auth token* .

Here's the output without the auth token (bypassed check in bin/gist).

$ gist -l username Traceback (most recent call last):	7: from /usr/local/bin/gist:23:in `<main>'	6: from /usr/local/bin/gist:23:in `load'	5: from /var/lib/gems/2.5.0/gems/gist-5.1.0/bin/gist:167:in `<top (required)>'	4: from /var/lib/gems/2.5.0/gems/gist-5.1.0/lib/gist.rb:213:in `list_all_gists'	3: from /var/lib/gems/2.5.0/gems/gist-5.1.0/lib/gist.rb:269:in `get_gist_pages'	2: from /var/lib/gems/2.5.0/gems/gist-5.1.0/lib/gist.rb:287:in `pretty_gist'	1: from /usr/lib/ruby/2.5.0/json/common.rb:156:in `parse' /usr/lib/ruby/2.5.0/json/common.rb:156:in `parse': 765: unexpected token at '' (JSON::ParserError) 

This change was tested on GitHub and GitHub Enterprise.

• @ConradIrwin let me know if this if true and I will follow up with a cleanup PR that removes the other extraneous checks in other functions. I suspect this may not be true if you want to support anonymous listing of public gists (without login). But that currently doesn't appear to be supported after 09813a3 .

[ConradIrwin]

@lucasrangit thanks for this, I'd love a pull request that cleans up the rest :).