GPII-1318: Added node_modules to .gitignore

Author: amb26

.gitignore

@@ -0,0 +1,11 @@
+/node_modules/
+
+/examples/gpii-oauth2-sample-client/node_modules/
+/examples/gpii-oauth2-sample-client-passport/node_modules/
+/examples/gpii-oauth2-single-process-auth-server/node_modules/
+
+/gpii/node_modules/gpii-oauth2/gpii-oauth2-authz-server/node_modules/
+/gpii/node_modules/gpii-oauth2/gpii-oauth2-utilities/node_modules/
+
+npm-debug.log
+*.bak