Json File Schema

[yingli-NREL]

Related issue: #405

Three python files in the tests folder were created to validate JSON data files against their corresponding JSON schema files:

• ecm_schema_test.py – validates all ECM JSON data files against ecm_schema.json
  The schema was developed by referring to the ECM JSON schema and existing ECM JSON data files.
  The tsv_features and tsv_source properties do not exist in the current ECM JSON data files, so the schema was created based solely on the ECM JSON schema.
• mseg_res_com_cz_schema_test.py – validates mseg_res_com_cz.json against mseg_res_com_cz_schema.json.
  The schema was developed by referring to existing mseg_res_com_cz.json
• cpl_res_com_cz_schema_test.py – validates cpl_res_com_cz.gz against cpl_res_com_cz_schema.json .
  The schema was developed by referring to existing cpl_res_com_cz.gz