Remove mailcatcher

The mailcatcher gem does not work correctly when executed through Bundler.

plugins/bundler/bundler.plugin.zsh

@@ -6,7 +6,7 @@ alias bu="bundle update"
 
 # The following is based on https://github.com/gma/bundler-exec
 
-bundled_commands=(annotate berks cap capify cucumber foodcritic foreman guard irb jekyll kitchen knife mailcatcher middleman nanoc puma rackup rainbows rake rspec ruby shotgun spec spin spork strainer tailor taps thin thor unicorn unicorn_rails)
+bundled_commands=(annotate berks cap capify cucumber foodcritic foreman guard irb jekyll kitchen knife middleman nanoc puma rackup rainbows rake rspec ruby shotgun spec spin spork strainer tailor taps thin thor unicorn unicorn_rails)
 
 # Remove $UNBUNDLED_COMMANDS from the bundled_commands list
 for cmd in $UNBUNDLED_COMMANDS; do