yaws_json2 [JIRA: RCS-364]

[jonasrichard]

I worked from two dev hosts with basho bench and just noticed that one host had deps/yaws_json2 but another didn't have. Probably it is a dependency of a dependency but it would be good if it is in the deps and in the escriptized libraries. Since basho bench is perfect for sending http requests and process json responses. So in that case I wouldn't need to fork basho bench, and it is easier to include it in multi-person projects.