Fix doc strings
Failing test
Add `columnCount` var to Editor::moveLeft and Cursor::moveLeft
Make moveLeft() with huge values span multiple rows
Add columnCount to moveRight
Remove the max call
Update doc strings
Add columnCounts to selection methods
Considerably more elegant (and correct) moveLeft and moveRight
Merge pull request #3446 from atom/bo-move-var

Add columnCount variables to cursor::moveLeft and moveRight and related methods