Move dependencies to this plugin and use Java version 1.8

[timmywil]

• The dependencies are included to reduce the amount of setup required to use react-native-spokestack.
• react-native-track-player sets the same compileOptions. It seems to help with some compile errors.
• Updates the setup instructions in the README. The goal is to get it down to react-native link and adding <uses-permission android:name="android.permission.RECORD_AUDIO" />, but it currently still requires some of the packagingOptions to avoid duplicate lib imports from java land. The ideal solution would be to figure out where the duplicates are coming from and exclude them, but I didn't want to spend too much time on that.

Ref #15

[timmywil]

@noelweichbrodt Yea I have them working in radiobrain.