POM: improve profiles
POM: improve profiles

1) Move FindBugs and PMD report generation to a separate profile - findfugs
2) dynamically choose maven-site-plugin version for M2 or M3

UcasRichard/snakeyaml,yskumar007/snakeyaml,SorinS/snakeyaml,votinhthieugia/snakeyaml,virustotalop/snakeyaml,Mause/snakeyaml,jeremypepper/snakeyaml,Akkrite/snakeyaml,thinkofdeath/snakeyaml,ldh0826/snakeyaml,RussellSpitzer/snakeyaml,yeison/snakeyaml,Fighter777/snakeyaml,yishenggudou/snakeyaml,joy32812/snakeyaml,mc-nekoneko/snakeyaml,ilantoren/snakeyaml,marcuskara/snakeyaml,umeding/snakeyaml,cuizhennan/snakeyaml,youxinren/snakeyaml,nxbdi/snakeyaml,mapiman/snakeyaml