feat(ng_package): allow for data targets to be provided without substitutions being applied

This change ignores text substitution for files passed to the  attribute, ensuring binary assets are preserved intact in the final package.

Author: josephperrott

src/ng_package/index.bzl

@@ -8,6 +8,7 @@ def ng_package(
         substitutions = {},
         tags = [],
         replace_prefixes = {},
+        data = [],
         **kwargs):
     angular_package_format(
         name = "%s_apf" % name,
@@ -24,7 +25,7 @@ def ng_package(
         name = name,
         srcs = [
             "%s_apf_substituted" % name,
-        ] + nested_packages,
+        ] + nested_packages + data,
         replace_prefixes = dict({
             "%s_apf_substituted/%s_apf" % (name, name): "/",
             "schematics/npm_package/": "schematics/",