chore: cost of dependencies in react-native

[nimish-gupta]

Here is the list of the dependencies along with their sizes.
https://www.dropbox.com/s/g3hzj3q07xtrbl3/Screenshot%202019-02-15%2004.54.54.png?dl=0

We can go through this list and replace the packages which are causing the increase in the bundle size.

[nimish-gupta]

FYI, used this package to determine the size of the dependencies. @cpojer

[cpojer]

Thanks for doing this analysis. We'll use as a guidance to reduce some of our dependencies but I'm gonna close this issue as we have the Lean Core issue to track it already.