The build script looks for the client library in Maven Central. It is possible
to use a local .aar by placing it in a folder "aars" in the base folder, and
uncommenting the flatDir{} section in the base build.gradle.
Requires I2P source revision 116c7da67b5bb23b91f9fb55980ceb9865ae7d0a or later
(ie. cannot be built against 0.9.13 source, must use an install for that).