Added examples of yaml files for application and routes.json files.
Update docs/dev_guide/topics/mojito_testing.rst

checked the flag modified
Made edits.
Merge pull request #951 from zhouyaoji/docs_add_yaml_exs

[doc: GH Issue #919] Added examples of YAML configuration and linked to a JSON to YAML utility in the Mojito Configuration chapter.
Merge pull request #949 from kinlum/patch-1

Update docs/dev_guide/topics/mojito_testing.rst