Adds ability to bounce on mount

[shercoder]

1. Adds boolean prop called bounceOnMount which swipes the row enough to
   expose/educate user there are buttons behind the top view.
2. Exposes two methods: bounceRight and bounceLeft to manually
   bounce the Swipeable row.

Fixes #32

[Cederman]

Can we please merge this?

[shercoder]

@Cederman I have been thinking about merging this branch into master of the clone I made and keep that as active so other devs can continue to contribute to this lib. This repo seems dead now but it is still usable.

[Cederman]

@shercoder Ah, please do. Have you been able to come in contact with @jshanson7 to verify? If a formal handover is in place it would be nice to direct users to the new "home".

Update: Or just add you as a maintainer to this repo.

[shercoder]

@Cederman I haven't done that. I'll reach out to him today.

[Cederman]

@shercoder Due to inactivity on the matter, I took the freedom to publish this under a new package (as you proposed). Hope this is fine with you @shercoder: https://www.npmjs.com/package/react-native-swipeable-row. I'll gladly add you as a maintainer.

[shercoder]

@Cederman I don't have any problem with it. I think that's good.

Yes, you can add me as a maintainer for it. thank you :)

[Cederman]

Done :)