Fix potential out of memory error

A crash can occur in Android with OutOfMemoryException. This release avoids that by using the recommended HTTP library: https://github.com/gotev/android-upload-service/wiki/Setup#use-custom-http-stack

Package name change

Two big things happened in version 2.0. First, the Android package name had to be changed, as it conflicted with our own internal app. My bad. Second, we updated the android upload service dependency to the latest, but that requires the app have a compileSdkVersion and targetSdkVersion or 25.

Upgrade instructions in README

RN 0.40 integration error + iOS responseBody

Thanks to @chrisharrison, @thatjuan, and @ox-michaelradionov.

Custom upload ID

Thanks to @rkretzschmar in PR #6, we have a custom upload ID field.

v0.1.0

New 'method' param allows you to customize HTTP method. PRs to fix events firing after reload.