grunt minifies course and config json unintentionally in two tasks

[oliverfoster]

create-json-config and schema-defaults both inadvertently strip the whitespace from the course.json and config.json files making them unreadable.

https://github.com/adaptlearning/adapt_framework/blob/master/grunt/tasks/create-json-config.js#L37
https://github.com/adaptlearning/adapt_framework/blob/master/grunt/tasks/schema-defaults.js#L66

vs

https://github.com/adaptlearning/adapt_framework/blob/master/grunt/tasks/tracking-insert.js#L48-L49

This, rather irritatingly means that I can't read the json of the course or config files, but I can for articles, blocks and components.

[tomgreenfield]

I'd +1 for minifying them all. I've had many cases in the past where I was mistakely editing the build files instead of src.

[oliverfoster]

I think we should have a separate task off the back of the "build" task collection to do that and not do it in these tasks. Called "minify-json" or something of the sort. Period.

[moloko]

done in 020ceb5