Add parallax to views

[jadnco]

Parallax should be added to ProfileView and SpotView using react-native-parallax-view.

The behaviour needs to be experimented with. I'm thinking it would differ for both views;

ProfileView

• User pulls down ScrollView => header image scales.
• User scrolls downwards => header image has parallax effect.

SpotView

• User pulls down ScrollView => spot image scales.
• User scrolls downwards => natural behaviour (no parallax)

This isn't something that can be implemented right away, there is no support for release candidates. I'm expecting an update to v0.18.0 should be about a week away.

[jadnco]

Since RN 0.18 has been released, I tried out that parallax component. It works, but the result is pretty much shit. Not the best performance wise, and there is not a whole lot of customizability.

Unless a better component is found (or custom one created) this is being crossed off the table.