geekdroid-firebase: allow to validate QueryPagingSource boundary key
This is useful when ordering by @ServerTimestamp field. When the document
hasn't been sent to server it can't be used as a boundary key has the server
timestamp is null. This change allows client to make the check and avoid an
IllegalArgumentException.
Geekdroid
==========
Geekdroid is an Android library used in various Android projects.
Geekdroid is an open source library and is licensed under the GNU General Public License 3 and any later version.
This means that you can get Geekdroid's code and modify it to suit your needs, as long as you publish the changes
you make for everyone to benefit from as well.
Geekdroid is built and maintained by community volunteers.
Modules
=======
The project is composed of 2 modules:
* geekdroid is the main library
* geekdroid-firebase contains utilities to work with Firebase and Google Play services
Build instructions
==================
Just use Gradle to build
./gradlew build