Fixes #52 making sure it sanitizes all the occurrences.

Sanitize function was only replacing the first special character found.
This changes makes sure it sanitizes all the occurrences of a special characters.

Author: c4milo

lib/sanitize.js

@@ -23,13 +23,17 @@ var chars = {
     "'": '''
 };
 
+function escapeRegExp(string) {
+    return string.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
+}
+
 exports.sanitize = function sanitize(value) {
     if (typeof value !== 'string') {
         return value;
     }
 
     Object.keys(chars).forEach(function(key) {
-        value = value.replace(key, chars[key]);
+        value = value.replace(new RegExp(escapeRegExp(key), 'g'), chars[key]);
     });
 
     return value;