Update composer files to include Brightcove library

Note that this composer.lock file reflects many changes. Once the
remaining deployment issues have been sorted out, come back to
this to verify that the automatic changes are all correct and
necessary.

https://github.com/18F/nsf/issues/78

Author: fureigh

composer.json

@@ -26,7 +26,8 @@
         ],
         "merge-plugin": {
             "include": [
-                "core/composer.json"
+                "core/composer.json",
+                "modules/brightcove/composer.json"
             ],
             "recurse": false,
             "replace": false,