Event Manager updates (dev)

[bernattorras]

Changes proposed in this Pull Request

• Style booking button
• Don't show timezone if it's an "all day" event

Testing instructions

• Open an event page (like this) and confirm that the "Submit Booking" button is styled as the "Join us" button
• If the event is "all day", confirm that the #_EVENTTIMEZONE placeholder isn't displaying anything.

Mentions https://github.com/a8cteam51/opensource-net/issues/49

[bernattorras]

MErging into develop to check the changes from the staging site.