Prepare version 3.0.0-alpha1.

Prepare release 2.5.1.

build.gradle: version 2.5.0 (release), add objectboxVersionNumber and…

… objectboxVersionRelease to simplify release process

Merge branch 'v2.4.1'

Merge branch 'v2.4.0'

prepare 2.4.0 RC

2.3.4

2.3.3

remove obsolete test testGetAll2AfterGetAndRemove

2.3.0