Changed types of reviews according to Gerrit 2.8

In Gerrit 2.8 type of marks are changed, CRVW became Code-Review,
APRV turned into Workflow with value +1. Previously Stackalytics handled
this by mapping from new types to old, but this doesn't support case
of approval marks.

Closes bug 1324080

Change-Id: I7de747b8df5722b840eea0f42b67665058a7ad03
Merge "Changed types of reviews according to Gerrit 2.8"