now uses NSNull comparison

Signed-off-by: Jake Bromberg <jake.bromberg@gmail.com>
cosmetic changes

Signed-off-by: Jake Bromberg <jake.bromberg@gmail.com>
app theme is now carolina blue. also there's now a dedicated root view controller class

Signed-off-by: Jake Bromberg <jake.bromberg@gmail.com>
fixed tab bar states

Signed-off-by: Jake Bromberg <jake.bromberg@gmail.com>