Add database_cleaner gem.

Adds the database_cleaner gem to ensure clean state for testing.
Add factory_girl gem.

Adds the factory_girl gem for Rails (actually, factory_girl_rails) as a
fixture replacement that might speed up test running times.
Add first spec for Experience.

This commit has emotional value only. I want to do this right. I will
keep testing properly only to get to the highest condition of testing expertise.
Comply with expectation syntax.
Replace ActiveRecord objects for FactoryGirl objects.
Regroup and reorder gems in Gemfile.
Add dummy secret_key_base for testing environment.
Add Capybara gem to assist integration testing.

Adds the Capybara gem and friends to improve Psychlopedia's integration tests.
Change database_cleaner strategy to truncation.
Fix based on Hound comments.
Delete *all* RSpec files and configuration to start over.
Set testing environment to basics.
Add specs for validations and associations.
Add Cocktail factory.
Fix based on Hound comments.
Add factory for experiences with cocktail data.
Add first, basic acceptance tests.
Fix based on Hound comments.
Add acceptance tests for new Experiences.
Add acceptance test for creating new Experiences.