Template protocol

This merge request implements the support for database V2 with protocol details moved into the ProtocolTemplate object.

This allows for reuse of these templates that were previously duplicate for each entry in the database definition.

Fixes #20 (closed)

Related to beat.core#64

beat/backend/python/test/prefix/databases/integers_db/2.json

+{
+    "schema_version": 2,
+
+    "root_folder": "/tmp/path/not/set",
+    "protocols": [
+        {
+            "name": "double",
+            "template": "double/1",
+            "views": {
+                "double": {
+                   "view": "Double"
+                }
+            }
+        },
+        {
+            "name": "triple",
+            "template": "triple/1",
+            "views": {
+                "triple": {
+                   "view": "Triple"
+                }
+            }
+        },
+        {
+            "name": "two_sets",
+            "template": "two_sets/1",
+            "views": {
+                "double": {
+                   "view": "Double"
+                },
+                "triple": {
+                   "view": "Triple"
+                }
+            }
+        },
+        {
+            "name": "labelled",
+            "template": "labelled/1",
+            "views": {
+                "labelled": {
+                   "view": "Labelled"
+                }
+            }
+        },
+        {
+            "name": "different_frequencies",
+            "template": "different_frequencies/1",
+            "views": {
+                "double" : {
+                   "view": "DifferentFrequencies"
+                }
+            }
+        }
+    ]
+}