Version and Dependency support branches, added unittests.
Version and Dependency support branches, added unittests.

D-Programming-Language/dub,y12uc231/dub,alexeibs/dub,MartinNowak/dub,grogancolin/dub,Abscissa/dub-data-mod,dreamsxin/dub,nazriel/dub,Flamaros/dub,jelmansouri/dub,schuetzm/dub,Geod24/dub,gedaiu/dub,p0nce/dub,rjframe/dub,xentec/dub,Abscissa/dub,jeanbaptistelab/dub