Rename an improper variable name
Unify the style
Support move-x-function
Merge branch 'support-move-x-function'

Close gh-23.
Add release notes on 0.4.2
Bump up version to 0.4.2
Happy new year 2014
Update a note on count support (gh-22)
Refine a note on extending selection
Merge branch 'prepare-0.4.2'