First step for upgrading to rails 3.

Check rake rails:upgrade:check for next steps.
Modified new session store initializers.
Updated development.rb.SAMPLE.
Updated actionmailer classes and API.
Upgraded exception notifier plugin.
New validate_on/before syntax.
Do not load exception notifier in development mode.
Updated router. Temporarly replaced routing filter with rails internal.
Upgraded will_paginate.
Refactored login module. Implemented standard sessions controller.
Fixed bug in routes.rb
Replaced protoype with jquery. Some fixes in mailer class.
Fixed missing js for login layout.
Fixed language and flash divs.
Some improved validations for task.
Updated rails i18n translations.
Include session_store in git repo, but not the secret token.
Added simple form for easier form building.
Some fixes for tasks.
Added new autocomplete for task assignments.

Introduced the cool jquery token plugin.