Update Transifex link

* Point to project instead of orga
Add Raketask to update translations
Update translations via rake task
Update README
Extend redmine i18n with pluralization + pluralizer set
Update locales
Release 2.3.2 bug fix release
Update i18n pluralize patch

* Do not use I18n::Backend::Pluralization as it does not work with
  redmine locales
Use forked transifex gem
Update locales
Release 2.3.3
Upgrade redmine versions
Add rake dist task to build targz
Merge Rakefile, spec_helper and runner utils from master
Check for issue_id plugin method
Use bluebird only as polyfill
Merge branch 'stable-v2'

Conflicts:
	Gemfile
	README.md
	Rakefile
	app/models/rdb_dashboard.rb
	app/views/rdb_dashboard/issues/_issue_menu.html.haml
	config/locales/de.yml
	config/locales/es.yml
	config/locales/it.yml
	config/locales/ja.yml
	config/locales/ru.yml
	config/locales/zh-TW.yml
	config/locales/zh.yml
	init.rb
	spec/plugin/spec_helper.rb