Merge tag '0.5.0' into develop

0.5.0
Refactor.
Refactor.
Add flay task.
Enable test coverage in codeclimate.
Update codeclimate token.
Refactor.
Add app_spec.rb
Test quit command.
Extract Text2048::CursesView::Colorize.
Add flog task.
Refactor.
Refactor.
Add YARD and inch for documentation.
Refactor.
Refactor.
Fix undefined method error in 1.9.
Add YARD comments.
Add more RSpec tests.
Add more RSpec tests.