HttpURLConnectionWorker: made subclass-friendly.
CHANGES
[maven-release-plugin] prepare release 1.6.1
[maven-release-plugin] prepare for next development iteration
RESTClient stuff.
Added OkHttp worker.
RESTClient tweaks & tests.
DroidPartsGram: removed mdpi & hdpi icons.
AsyncTask: fixed incorrectly handled null result.
DroidPartsGram: use OkHttp.
CHANGES
[maven-release-plugin] prepare release 1.6.2
[maven-release-plugin] prepare for next development iteration
RESTClient: postFile(...) => postMultipart(...).
Add optional Content-Type header for multipart file upload