add 2nd test to command_builder_spec
extract duplicated strftime to class constant
remove redundant test
add more BillingLogic::CommandBuilders::ActionObject tests
add more tests (including two that appear to surface bugs
add another test of two products
refactor long #to_s method
command_builders.rb refactoring
remove 'Do Not Use in Production' warning from README because that ship has sailed
clean up README.rdoc
raise exception if BaseStrategy#add_commands_for_products_to_be_added! is called
clean up whitespace in README.rdoc
add BillingCycle tests; fix bug that miscalculated the next future anniversary when anniverary is > 1 cycle in the future
add documentation
clean up some of my new tests; add definition of IndependentPaymentStrategy
add Billing-Logic structure to README
define Independent/Single payment strategies
explain independent/single payment strategies' default payment_command_builder_class
remove outdated junk from README; add BaseStrategy info
[Completes #52070441] replace deprecated 'source :rubygems'