[WIP][DD-551] upgrade to java 8
[WIP][DD-551] upgrade to java 8

dswarm/dswarm,zazi/dswarm,philbritton/dswarm,knutwalker/dswarm,knutwalker/dswarm,dswarm/dswarm,zazi/dswarm,knutwalker/dswarm,philbritton/dswarm,dswarm/dswarm,janpolowinski/dswarm,janpolowinski/dswarm,philbritton/dswarm,zazi/dswarm