BiasSgd framework
Add BiasSgd
Merge branch 'first-branch' of https://github.com/MohtaMayank/graphchi-java into mayankBranch

Add BiasSgd to the branch
temp commit
commit trial
Merge branch 'first-branch' of https://github.com/MohtaMayank/graphchi-java into mayankBranch
modify biasSgd