small fix in fake command
calculate Total Group members lent amount
calculate group members total impacts
show group total impact in group blade file
calculate group lent amount for this month

not seperating active loans bids for this month as in old code because
of the loan threshold of 16 days
calculate group total impact this month
show group total impact for this month
calculate group lent amount for last month
calculate group total impact last month
show group total impact for last month
refactor group impact calculations
show group impacts in groups page
Merge pull request #174 from SingularityGuy/lending/group-impact

Lending/group impact