Revised document library cache on EMR (#458, #462).
Fixed testcase for Paaquet timestamp (#460).
Release note and changes for version 0.7.2 (#458).
Merge remote-tracking branch 'private/issue/458-M9' into 0.7-develop
Merge remote-tracking branch 'private/issue/460-M9' into 0.7-develop
Merge tag '0.7.2-M10' into 0.7-hadoop1-develop

Released version 0.7.2-M10