modified README.md
Bound "togglePreview" method for export.

I needed to customize the editor's toolbar for a project, and encountered an issue where I couldn't make the preview button work, because Editor.togglePreview didn't exist.
Update README.md
Merge pull request #56 from jeanCarloMachado/master

Update README.md added info of how to recover data
Merge pull request #55 from mortie/patch-1

Bound "togglePreview" method for export.
fixed multiple words list bug
Added example

Example provided by owner. Fixes #59
added autofocus and tabsise
added DS_Store to ignore list
replaced window with var
added two more flexible commands
added strikethrough functionality
added command keymaps
Merge pull request #61 from whoisandie/master

Tweaked and Added features
Merge pull request #60 from Leo2807/master

Added example
Add .value method for getting and setting value
Merge remote-tracking branch 'upstream/master'
cdn source issues/35