dev-api: add developer portal, OpenAPI spec, and Flatenbadet case study

- New /developers/ page with API docs, SDKs, pricing, use cases
- OpenAPI 3.0 spec for Orders, Missions, Photos, Analytics
- Case study: Glasskiosken i Flatenbadet — complete ROI analysis
- Updated /order/ with recurring missions and frequency dropdown

services/frilans-payout/node_modules/json-buffer/README.md

@@ -0,0 +1,24 @@
+# json-buffer
+
+JSON functions that can convert buffers!
+
+[![build status](https://secure.travis-ci.org/dominictarr/json-buffer.png)](http://travis-ci.org/dominictarr/json-buffer)
+
+[![testling badge](https://ci.testling.com/dominictarr/json-buffer.png)](https://ci.testling.com/dominictarr/json-buffer)
+
+JSON mangles buffers by converting to an array...
+which isn't helpful. json-buffers converts to base64 instead,
+and deconverts base64 to a buffer.
+
+``` js
+var JSONB = require('json-buffer')
+var Buffer = require('buffer').Buffer
+
+var str = JSONB.stringify(Buffer.from('hello there!'))
+
+console.log(JSONB.parse(str)) //GET a BUFFER back
+```
+
+## License
+
+MIT