Improve the output for better usability

[angiehjort]

When everything is done print the result: valid or invalid? I just came in to read that one word

Format JSON output

Remove empty object in the end

currently

[
{"id":"NON_DDF_FOLDER","type":"This folder is not DDF","path":"/Volumes/angie-data/_GIT/ddf--gapminder--systema_globalis/etl","tags":["WARNING","FILE_SYSTEM"]},

{"id":"INCORRECT_JSON_FIELD","type":"Incorrect JSON field","path":"/Volumes/angie-data/_GIT/ddf--gapminder--systema_globalis/ddf--entities--geo--country.csv","data":{"column":"arb5","line":55,"value":"Congo [DRC]"},"tags":["WARNING"]},

{}]

suggested

WARNING: This folder is not DDF /etl
WARNING: Incorrect JSON field (55:arb5): "Congo [DRC]" in /ddf--entities--geo--country.csv
Validation complete. Your DDF is valid!

[angiehjort]

The above is largely solved with extra file/gapminder offline implementation

Further improvement: when creating datapackage please output the result to the console "Datapackage creates successfully" rather than creating a log file for that (i need to do it often and remove the file every time!)

create a log file only when there are issues

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when validation is complete with errors or warnings print the total error and warning count

it is useful because i expect to have the 2 warnings in the file but too lazy to open it and check if there aren't more of them