plugins: install redmine-tags-2.1.0 instead of using the master
plugins: install use redmine-announcements-1.3 instead of using the git master
plugins: upgrade redmine_people plugin to version 0.1.8
plugins: add gems required by plugins in their respective Gemfile
plugins: clean up install script
init: execute rake takes using bundle exec
install: specify --without development tests in bundle install command
install: add fastercsv and yard to redmine Gemfile
upgrade to redmine version 2.5.1
use sameersbn/ubuntu:12.04.20140418 as the base image
optimize RUN statements