forward all error messages to user

Instead of trying to parse the error messages in the connection
manager, forward all errors to the user to deal with on an as-needed
basis

lib/dialects/mssql/connection-manager.js

@@ -44,30 +44,7 @@ ConnectionManager.prototype.connect = function(config) {
 
     connection.on('connect', function(err) {
       if (err) {
-        switch (err.code) {
-        case 'ELOGIN':
-          reject('Login failed.');
-          break;
-        case 'ETIMEOUT':
-          reject('Connection timeout.');
-          break;
-        case 'EALREADYCONNECTED':
-          reject('Database is already connected!');
-          break;
-        case 'EALREADYCONNECTING':
-          reject('Already connecting to database!');
-          break;
-        case 'EINSTLOOKUP':
-          reject('Instance lookup failed.');
-          break;
-        case 'ESOCKET':
-          reject('Socket error.');
-          break;
-        default:
-          reject(err);
-          break;
-        }
-
+        reject(err);
         return;
       }