* Modified Wiki.js to include invite_id parameter when necessary.
* Increased storage quota (and price) for premium rate plan.
* Added a note displayed when redeeming an invite, with links to signup and login.
* Fixed Invite.sql_update() to have SQL params in proper order.
* Fixed bug where email addresses containing "-" were considered invalid.
* Made UI for inviting other people to your notebook.
* Tweaked the rate plans and added a new one.