CM: WIP for android http client

[carlo-backblaze]

• WIP, do not merge

• Will most likely be split into it's own repository

• Creating separate gradle project including an Android application for instrumented tests and examples httpclient_android/app

• Creating a httpclient library targeting Android frameworks in httpclient_android/http_client

• Creating base library unit tests

• Removing the Apache HTTP Client framework dependencies

• Using URLConnection, HttpUrlConnection, and HttpsUrlConnection

• Will be outputting .aar library for publishing