Merge pull request #79 from x-team/develop

0.14 Release
Change "Update" button to "Preview"

...to help guide users to press the "Save & Publish" at the top of the
customizer.
Change the "Update" / "Preview"button to read "Apply"
Merge branch 'master' of github.com:arnoesterhuizen/wp-widget-customizer into develop

Closes #80