gist: Remove anonymous option.

Author: esteban zapata

bin/gist

@@ -24,16 +24,12 @@ specified STDIN will be read. The default filename for STDIN is "a.rb", and all
 filenames can be overridden by repeating the "-f" flag. The most useful reason
 to do this is to change the syntax highlighting.
 
-If you'd like your gists to be associated with your GitHub account, so that you
-can edit them and find them in future, first use `gist --login` to obtain an
-Oauth2 access token. This is stored and used by gist in the future.
+All gists must to be associated with a GitHub account, so you will need to login with
+`gist --login` to obtain an Oauth2 access token. This is stored and used by gist in the future.
 
 Private gists do not have guessable URLs and can be created with "-p", you can
 also set the description at the top of the gist by passing "-d".
 
-Anonymous gists are not associated with your GitHub account, they can be created
-with "-a" even after you have used "gist --login".
-
 If you would like to shorten the resulting gist URL, use the -s flag. This will
 use GitHub's URL shortener, git.io. You can also use -R to get the link to the
 raw gist.
@@ -50,7 +46,7 @@ original gist with the same GitHub account.
 If you want to skip empty files, use the --skip-empty flag. If all files are
 empty no gist will be created.
 
-Usage: #{executable_name} [-o|-c|-e] [-p] [-s] [-R] [-d DESC] [-a] [-u URL]
+Usage: #{executable_name} [-o|-c|-e] [-p] [-s] [-R] [-d DESC] [-u URL]
                           [--skip-empty] [-P] [-f NAME|-t EXT]* FILE*
        #{executable_name} --login
        #{executable_name} [-l|-r]
@@ -92,10 +88,6 @@ Usage: #{executable_name} [-o|-c|-e] [-p] [-s] [-R] [-d DESC] [-a] [-u URL]
     options[:update] = update
   end
 
-  opts.on("-a", "--anonymous", "Create an anonymous gist.") do
-    options[:anonymous] = true
-  end
-
   opts.on("-c", "--copy", "Copy the resulting URL to the clipboard") do
     options[:copy] = true
   end