Fixed rake task to create weekly tasks.
Added database indexes. Performance boost for balance page.

Conflicts:

	db/schema.rb
Preisänderungen beim Abrechnen können auch global angewandt werden.
Umlaute eingefügt
Merge pull request #72 from davidrabel/global-article-update

Preisänderungen beim Abrechnen können auch global angewandt werden.
Added rbenv version file to change ruby version.
Bumped new version: 3.1.1
Recommend using rails3 branch for beginners.
Removed acts_as_ordered. Fixed bug in group_orders archive.
Reenabled sidebar..
Added twitter bootstrap layout. Adapt home page.
Fixed login, new_password and invitation views.
Replace will_paginate with kaminari. Fixed foodcoop/users page.
Fixed foodcoop/ordergroups and workgroups views.
Fixed messages. New styling for token input plugin.
Improved tasks.
Fixed wiki pages.
Remove searching shared articles by list.

This is necessary to go with newest fixes in sharedlists app.
Fixed admin, orders, wiki views. Converted all erb to haml.
Fixed deliveries.