Move selection commands to the command package
Fix redraw lag
combine const statements
Merge pull request #26 from gchp/visual-mode

Move selection commands to command module
Set the dirty flag on the view each time the selection changes.
Add .travis.yml
Update build status to point to Travis CI
Add some utility methods to Cursor.
Left -> LeftOf, Right -> RightOf
Some comments on Cursor. Simplify SortCursors.
Addded ability to toggle search highlighting
Merge pull request #28 from gchp/search

Addded ability to toggle search highlighting