Link to Memberful.com is now https.
Fix up plugin setting screen presentation for WordPress 3.8.
Make Restrict Access box a bit more flexible.
Remove top level menu item for Memberful (use a sub menu item in Settings instead).
Remove old menu icon that is no longer in use.
Tweak error messages.
Tested up to WordPress 3.8.
Merge pull request #69 from memberful/wp38

Release version 1.0.3 Tuesday December 10th