feat(bazel): support more options in spec-bundle rule

Support `config` in `spec-bundle` rule. This is useful for supporting
e.g. path mappings.

Author: devversion

bazel/spec-bundling/index_rjs.bzl

@@ -38,15 +38,15 @@ def spec_bundle(name, deps, bootstrap = [], testonly = True, config = {}, **kwar
         **kwargs
     )
 
-def spec_bundle_amd(name, workspace_name, **kwargs):
+def spec_bundle_amd(name, workspace_name, config = {}, **kwargs):
     amd_name = "%s/%s/%s" % (workspace_name, native.package_name(), name + ".spec")
 
     spec_bundle(
         name,
-        config = {
+        config = dict({
             "globalName": "__exports",
             "banner": {"js": "define(\"%s\", [], function() {" % amd_name},
             "footer": {"js": "return __exports;})"},
-        },
+        }, **config),
         **kwargs
     )