Change de text domain to match the WordPress.org slug

This is why :
http://ottopress.com/2013/language-packs-101-prepwork/
Don't show the widget form if the twitter connection information are not filled
Only one script for all Tweets

This should be faster to render.

Method find here:
https://dev.twitter.com/docs/tfw-javascript
better sanitize for the widget form
Make it usable with the widget preview manager

There was a problem with the use of transient
http://make.wordpress.org/core/2014/04/17/live-widget-previews-widget-management-in-the-customizer-in-wordpress-3-9/
retrocompatibility
Move the option page to the settings section
Tag version 0.6