Add rapidjson submodule
Basic benchmark framework with RapidJSON and strdup
Added YAJL
Fix gcc compilation errors
Update YAJL test with newer APIs
Change YAJL include folder

Prevent making the submodule dirty.
Verify roundtrip statistics
Rename test name: rapidjson -> RapidJSON
Add JsonCPP
Add statistics benchmark
Compare statistics with reference (RapidJSON)
Disable sorting in result table
Implement strdup's statistics by strlen()
Fix prettyify statistics
indentation
Added overall results