Add bower and node files/dirs to .gitignore

Change-Id: I3900aec372167fb952e81b3049e7bbd29e41f186

.gitignore

@@ -14,21 +14,24 @@
 /.classpath
 /.factorypath
 /.idea
+/.ijwb
 /.metadata
 /.project
 /.settings/org.eclipse.ltk.core.refactoring.prefs
 /.settings/org.eclipse.m2e.core.prefs
 /.settings/org.maven.ide.eclipse.prefs
+/.vscode
 /bazel-*
 /bin/
+/bower_components/
 /eclipse-out
 /extras
 /gerrit-package-plugins
 /gwt-unitCache
 /infer-out
 /local.properties
+/node_modules/
+/package-lock.json
 /plugins/cookbook-plugin/
 /test_site
 /tools/format
-/.vscode
-/.ijwb