Merge pull request #6 from oggy/global-command-palette

Toggle command palette from anywhere.
More keybindings are moved to '.body'. Refactored motion and mark commands.
Updated the changelog
Prepare 0.2.2 release
ctrl-v and alt-v will now retain the mark if present.
Prepare 0.2.3 release
Fix editing commands in non-editor panes (e.g. settings).
No need to export getActiveEditor.