Add tests about &selection
Refactor - Take a:fallback_wise to s:range_select
Use s:range_select for objects based on a pattern
Use s:range_select for objects based on a function
Support exclusive &selection
Merge branch 'support-exclusive-selection'

Close gh-16.
Add release notes on 0.4.1
Add a note on the repeatability problem
Fix typos in examples

Close gh-18.
Bump up version to 0.4.1
Merge branch 'prepare-0.4.1'