feat(api): API specification v2.7

* update(spec): specifiy `produces` and `consumes` on endpoints instead of globally
* feat(scores): now support Guitar Pro (GP3, GP4, GP5, GPX, GP), PowerTab, TuxGuitar and MuseScore files in POST /scores
* feat(scores): add support for `filename` when importing scores
* feat(collections): `parent` collection can now be a collection id when listing collections
* feat(collections): includes parent collections when listing scores
* feat(collections): add `creationDate` property in collection details
* feat(comments): add `staffUuid` for contextualized comments, which will completely replace `staffIdx` in the future
* feat(rights): now return a `isCollaborator` boolean property with the Score or Collection rights
* update(account): added new locales supported

Author: gierschv

Diff for: package.json

@@ -1,6 +1,6 @@
 {
   "name": "@flat/api-reference",
-  "version": "0.0.1",
+  "version": "2.7.0",
   "dependencies": {
     "bower": "^1.7.7",
     "connect": "^3.4.1",