Resolve "Display "folders" for environments"

Filipa Lacerda requested to merge 22539-display-folders into master

What does this MR do?

Adds the ability to show the grouped environments inside "folders". Adds several reusable vue components in order to accomplish the recursive tree data structure presented.

For the individual components, Jasmine tests were added. For the ones that depend of an API response, rspec tests are used.

Screenshots (if relevant)

Screen_Shot_2016-11-16_at_02.00.13 Screen_Shot_2016-11-16_at_02.00.25 Screen_Shot_2016-10-17_at_16.08.50


Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #22539 (closed)

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