Add better examples to documentation.
Add better examples to documentation.

Fixes exponentjs/react-native-infinite-scroll-view#28
Fixes exponentjs/react-native-infinite-scroll-view#7
Fixes exponentjs/react-native-infinite-scroll-view#1
Addresses exponentjs/react-native-infinite-scroll-view#21

exponentjs/react-native-infinite-scroll-view