improve proptypes checking

various fixes: custom avatar, containerStyle passing, multiline false

- New prop `isLoadingEarlier`

- `title` prop of `Send` component has been renamed to `label`
- PropTypes checking

fix readme

Merge pull request FaridSafi#100 from FaridSafi/0.1.0

0.1.0

bump version

Fix image position, Add hideTextInput prop