style whole app

[kchia]

• [ ] UI is a little too black and white
• [ ] CareLocator and reminder date picker don't match rest of app's style
• [ ] Some buttons are square, some are rounded
• [ ] Fix up CareLocator list display
• [ ] Update splash screen and launch image

[kchia]

As part of this ticket, we should also find out how to use Native Base's themes properly, rather than adding inline styles.

[dsernst]

yeah, makes sense

[kchia]

done.