Updated selecium-webdriver to 2.43.0.

Works now with recent firefox/ubuntu.

Conflicts:
	Gemfile.lock
Delete memberships when deleting associated groups.

Conflicts:
	app/models/group.rb
Remove all memberships where belonging group was deleted.

Conflicts:
	db/schema.rb
Allow adding tracking code for webstatistics service. E.g. piwik.
add webstats_tracking_code to configuration screen (closes foodcoops#311)

Conflicts:
	app/views/admin/configs/_tab_others.html.haml
	config/app_config.yml.SAMPLE
be more robust showing config list
fix foodcoop-adam default config
use new Mollie API
add payment details to financial transactions
show payment details in finance + ordergroup home
allow to skip notification after transaction
use financial transaction payment details with Mollie API
Support more complex Mollie transaction fees.
fix signup plugin after transaction change
fix Mollie buglets
show proper error when all articles are deselected in order edit
add pickup day to orders
first iteration
use affix for article info box
use proper form field names + show goa values