Report a better error if bcrypt fails to load

node_modules/c9/passcrypt.js

@@ -5,7 +5,13 @@
  */
  
 var hashing = require('./hashing');
-var bcrypt = require('bcrypt');
+var bcrypt;
+try {
+    bcrypt = require('bcrypt');
+} catch (e) {
+    console.error("Failed to load brcrypt - binary version mismatch?", e.stack);
+    process.exit(1);
+}
 var SALT_LENGTH = 8;
 
 exports.encrypt = function(password, callback) {