add "slf4j.version" property and update version to 1.7.25 (#610)
add "slf4j.version" property and update version to 1.7.25 (#610)


zwets/flowable-engine,marcus-nl/flowable-engine,gro-mar/flowable-engine,marcus-nl/flowable-engine,marcus-nl/flowable-engine,paulstapleton/flowable-engine,marcus-nl/flowable-engine,martin-grofcik/flowable-engine,lsmall/flowable-engine,lsmall/flowable-engine,flowable/flowable-engine,paulstapleton/flowable-engine,flowable/flowable-engine,lsmall/flowable-engine,lsmall/flowable-engine,zwets/flowable-engine,dbmalkovsky/flowable-engine,dbmalkovsky/flowable-engine,flowable/flowable-engine,flowable/flowable-engine,yvoswillens/flowable-engine,martin-grofcik/flowable-engine,yvoswillens/flowable-engine,dbmalkovsky/flowable-engine,paulstapleton/flowable-engine,gro-mar/flowable-engine,gro-mar/flowable-engine,yvoswillens/flowable-engine,dbmalkovsky/flowable-engine,zwets/flowable-engine,martin-grofcik/flowable-engine,paulstapleton/flowable-engine,gro-mar/flowable-engine,zwets/flowable-engine,martin-grofcik/flowable-engine,yvoswillens/flowable-engine