Update README for 2-3-stable
Bump to 2.3.0
[frontend] Make thank_you_for_your_order message much smaller

It's not a header, just a notice. It doesn't need to be as big as the order number.
Bump to Rails 4.1.2
Add basic Devise configuration to stop dummy app warning
Clear all CHANGELOGs
Bump to 2.4.0.beta
Fix typo in add_line_item_id_to_spree_inventory_units migration

Fixes a bug introduced in #4822
Add Jersey to the default list of countries

Fixes #4890
Deleted the continue button on the RMA index

Deleted the continue button on the RMA index.
It does not have any function there.
Fixes #4891