Add a Gemfile for development dependencies
Add a Rakefile for routine works
Add a configuration file for Travis CI
Declare runtime dependencies
Ignore intermediate files
Farewell to mduem
Merge branch 'migrate-to-vim-flavor'
Add test cases for 'selection' differences
Support environments with exclusice 'selection'
Merge branch 'fix-for-exclusive-selection'

Close gh-3 and gh-4.
Add a release note for 0.0.4
Update copyright notices
Bump up version to 0.0.4
Change the name of the license
Merge branch 'prepare-for-0.0.4'