Merging 1.4.0 release branch commits
Add Greg Young as a donor
Bump tested version to 3.9
Remove extra Upgrade Notices
Update readme.txt for new URL
Alpha sort list of allowed elements
Add fieldset, legend, option, optgroup, select to hidden_fields. Fixes #100
Update CSS to same that WP core uses. Fixes #101
Merges #101 fix
Updated BG translation
#101 Readme addition
Updated readme for new form elements
Update version number to 1.4.1
Version 1.4.1