Hide internal key mappings from 'showcmd'

Close gh-3.
Fix a rendering problem on the cursor

Close gh-9.
Merge branch 'fix-rendering-problems'
Add an option to always show the current submode
Merge branch 'feature-always-show-submode'

Close gh-7.
Add notes on a limitation of {lhs} length
Merge branch 'add-note-on-lhs-limit'

Close gh-2.
Add release notes on 0.2.0
Bump up version to 0.2.0
Happy new year 2014
Merge branch 'prepare-for-0.2.0'