Made message appear if no images are found

Only appears if the user has no images. Prompts the user to tap the add image button. When they do so a message describing the take and choose picture buttons appears. Lines are drawn from the message to the buttons.
Forgot the sync message! Added it.
Made lines to buttons be drawn with core animation

Much nicer looking and animation is super smooth
Made the welcome message fade in

Looks more smooth and better draws attention when the message changes
Merge pull request #56 from montehurd/visualOnFirstLogin

Made messages appear if no images are found