Add polymer 1.0 to npm_modules

polymer_1.0.4/bower_components/prism/plugins/show-invisibles/prism-show-invisibles.css

+.token.tab:not(:empty):before,
+.token.cr:before,
+.token.lf:before {
+        color: hsl(24, 20%, 85%);
+}
+
+.token.tab:not(:empty):before {
+    content: '\21E5';
+}
+
+.token.cr:before {
+    content: '\240D';
+}
+
+.token.crlf:before {
+    content: '\240D\240A';
+}
+.token.lf:before {
+    content: '\240A';
+}