update gems
fix actions for active admin
Fix deprecation warning with example for RSpec
infer an example group's spec type from the file location
Add rspec-its, rspec-activemodel-mocks, rspec-collection_matchers
rename be_false to be false, be_true to be true
fix mistake while fixing specs
remove unnecessary spec/modules
Get rid of message: Instantiating a RSpec::Core::CommandLine with an array of options is deprecated. Use Instantiate a RSpec::Core::Runner with a RSpec::Core::ConfigurationOptions instance instead.
Use poltergeist instead of capybara-webkit
Revert "Get rid of message: Instantiating a RSpec::Core::CommandLine with an array of options is deprecated. Use Instantiate a RSpec::Core::Runner with a RSpec::Core::ConfigurationOptions instance instead."

This reverts commit 18f4d15eb84d391f510d144813e8ee3def05d5cb.