feat(downloads): alt 'media' handling to allow dls

This also includes documentation to state which methods actually support
media download, and how to achieve that.

Added TODO to not forget we should tell the user how to achieve these
kinds of things.

Fixes #21

etc/api/bigquery/v2/bigquery-api.json

@@ -1,11 +1,11 @@
 {
  "kind": "discovery#restDescription",
- "etag": "\"ye6orv2F-1npMW3u9suM3a7C5Bo/MCWK2CQLEDojVXJw1b4YdNiAmeY\"",
+ "etag": "\"ye6orv2F-1npMW3u9suM3a7C5Bo/QxG7oirHrzfDxJoQseQwOqPzaG0\"",
  "discoveryVersion": "v1",
  "id": "bigquery:v2",
  "name": "bigquery",
  "version": "v2",
- "revision": "20150309",
+ "revision": "20141112",
  "title": "BigQuery API",
  "description": "A data platform for customers to create, manage, share and query data.",
  "ownerDomain": "google.com",
@@ -1071,6 +1071,10 @@
    "id": "TableDataInsertAllRequest",
    "type": "object",
    "properties": {
+    "ignoreUnknownValues": {
+     "type": "boolean",
+     "description": "[Optional] Accept rows that contain values that do not match the schema. The unknown values are ignored. Default is false, which treats unknown values as errors."
+    },
     "kind": {
      "type": "string",
      "description": "The resource type of the response.",
@@ -1092,6 +1096,10 @@
        }
       }
      }
+    },
+    "skipInvalidRows": {
+     "type": "boolean",
+     "description": "[Optional] Insert all valid rows of a request, even if invalid rows exist. The default value is false, which causes the entire request to fail if any invalid rows exist."
     }
    }
   },