FIX: Users can only edit their own details (if not admin)
FIX: Users can only edit their own events (if not admin)
Added requirement of username and uniqueness of username and email for each user
Small CSS fix for the register - when errors, it was going out of the window
Added more validations to users; also, used the Devise.email_regexp for the email validations
Added Event cound and Events display for each user
Small CSS fix on the splash title - absolute positioning
Improved validations (sex) on user forms