Required files
rspec/core/dsl
rspec/core/extensions
rspec/core/load_path
rspec/core/deprecation
rspec/core/backward_compatibility
rspec/core/reporter
rspec/core/metadata_hash_builder
rspec/core/hooks
rspec/core/subject
rspec/core/let
rspec/core/metadata
rspec/core/pending
rspec/core/world
rspec/core/configuration
rspec/core/command_line_configuration
rspec/core/option_parser
rspec/core/configuration_options
rspec/core/command_line
rspec/core/drb_command_line
rspec/core/runner
rspec/core/example
rspec/core/shared_context
rspec/core/shared_example_group
rspec/core/example_group
rspec/core/version
rspec/core/errors
rspec/core/backward_compatibility
rspec/monkey