Uplift some plugin/dependency versions. (#223)

Updated mockito:
mockito-all v1.10.19 >> mockito-core v2.9.0

cucumber:
info.cukes >> io.cucumber
Version: 1.2.5 >> 2.4.0

Maven:
maven-war-plugin 3.1.0 >> 3.2.0

Jongo 1.3.0 >> 1.4.0
Spring-boot-starter 2.0.1 >> 2.0.8
jackson 2.9.5 >> 2.9.8

Surefire >> 2.22.0
failsafe >> 2.22.0
war >> 3.2.0

Author: Anders Breid