gistfile1.txt

Gemfile:
gem 'rails', '3.1.3'
gem 'spree', :git => 'https://github.com/spree/spree.git'
gem 'spree_skrill', :git => 'git@github.com:spree/spree_skrill.git', :branch => 'v2'

bundle update:
Using spree_core (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree_auth (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree_api (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree_dash (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree_promo (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree_sample (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree (1.0.0.beta) from https://github.com/spree/spree.git (at master) 
Using spree_skrill (0.70.1) from git@github.com:spree/spree_skrill.git (at v2) 
Using sqlite3 (1.3.5) 
Using uglifier (1.2.0) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.
[test4] $ bundle exec rake db:bootstrap AUTO_ACCEPT=1
rake aborted!
uninitialized constant Spree::BillingIntegration::Skrill