Merge pull request #90 from it-workshop/wp/CAROLINE-5/1

Wp/caroline 5/1
(cherry picked from commit 092d3ac88ae0846f72a83f6805f274f1c4cdeec8)
Fix jsoncpp commit ref.

(cherry picked from commit 331c88a2b9f459f4e89bc4f3c26f1dfc9c4e1d42)
Fix gtest submodule revision.
cc.
Merge pull request #95 from it-workshop/wp-1.0.0/CAROLINE-5/1

Merge pull request #90 from it-workshop/wp/CAROLINE-5/1