Added options to PR #16 + question

[rkstar]

I forked this repo and added a couple of options that help my project greatly. I put up a very small PR here: #16

My question is about when I install my fork either by github URL or directly from npm, I get a TON of typescript errors not even related to this package! This does not happen when I install react-native-infinite-pager from npm. I figure I must be missing part of the build or publish process somewhere.