This plugin enables github style emoji notation in textile formatter.

1. Copy the plugin directory into the plugins directory, for example:

   $ cd /home/redmine/redmine-${version}/plugins
   $ git clone https://github.com/tmy/redmine_gemoji
   

2. Run bundler (from the plugin directory):

   $ bundle install
   

3. Run rake task (from the Redmine root directory):

   $ rake emoji
   

4. Restart redmine

See http://www.emoji-cheat-sheet.com