feat: Unique transaction names for Swagger

BREAKING CHANGE: Users of Dredd hooks will have to change how they address
transactions - e.g. '/112 > GET' will have to be changed to '/112 > GET > 200 > application/json'

See apiaryio/dredd-transactions#63 for details. Closes #558.

package.json

@@ -32,7 +32,7 @@
     "clone": "^1.0.2",
     "coffee-script": "^1.10.0",
     "colors": "^1.1.2",
-    "dredd-transactions": "^2.0.0",
+    "dredd-transactions": "^3.0.0",
     "file": "^0.2.2",
     "gavel": "^0.5.3",
     "glob": "^7.0.5",