Avoid insertion of extra newlines when adding comments

Merged in upstream jsoncpp in pull request

https://github.com/open-source-parsers/jsoncpp/pull/52

Change-Id: Iae13e992765362399b23294b153c3ae1424704c0
BUG: Added missing build of lookup table

This fixes some uninitialized value complaints by valgrind.

Change-Id: I9298b18022049daecf5ab4871440c6953da2f02a
Merge topic 'jsoncpp_comment_adding' into master

371f18ad Avoid insertion of extra newlines when adding comments
Merge topic 'test_actor2d_valgrind' into master

b3b0536a BUG: Added missing build of lookup table