Add basic saving summary reports for groups
only interested in picking up the fix for http://tinyurl.com/oazjwq7 from 662d26771ed4f020276163574932a57cf9087829
Update CHANGELOG.md

for 1.7.2 release
Merge pull request #523 from openMF/mifosplatform-1.7.2

Mifosplatform 1.7.2