Ignore test folder when building npm package (#526)

* Added in npmignore to ignore any pems, certs or keys

* 2.0.5

* Updated pr to not include in bundle and added DS_Store to .gitignore

Co-authored-by: Daniel O'Sullivan <daniel.o'sullivan@lloydsbanking.com>

.gitignore

@@ -3,3 +3,4 @@ node_modules/
 .tern-port
 .idea
 yarn-error.log
+.DS_Store 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "passport-saml",
-  "version": "2.0.4",
+  "version": "2.0.5",
   "description": "SAML 2.0 authentication strategy for Passport",
   "keywords": [
     "saml",
@@ -29,7 +29,6 @@
   "main": "./lib/passport-saml",
   "files": [
     "lib",
-    "test",
     "multiSamlStrategy.js",
     "multiSamlStrategy.d.ts",
     "docs",