put the provider initialization code in "config/initializers/devise.rb".
This is needed because as the code is written now, the initialiazation
needs to be done after "SpreeSocial" is defined and before loading of
"spec/dummy/..." is finished, so it could not be put in "spec_helper.rb"
This is found out by trial and error, not sure why.

put in code in spec_helper to deal with poltergeist timeout error
changed how poltergeist does some "click" in spec/features/spree/sign_in_spec.rb to