add unit tests for various utility functions,

add integration test for LDAPClient,
add aiutomatic openldap configuration for testing through make,
add make targets for tests
improve make targets for build/clean,
update README with build and test instructions

test/test_config.json

@@ -0,0 +1,14 @@
+{
+    "listenPort": 80,
+    "ldapURL": "ldap://localhost",
+    "startTLS": true,
+    "basedn": "dc=test,dc=paasldap",
+    "sessionSecretKey": "test",
+    "sessionCookieName": "PAASLDAPAuthTicket",
+    "sessionCookie": {
+        "path": "/",
+        "httpOnly": true,
+        "secure": false,
+        "maxAge": 7200
+    }
+}