title: I cant add Issue to redmine (rest-api)
body: <p>I try create new Issue according to site:
  <a href="http://www.redmine.org/projects/redmine/wiki/Rest_Issues#Creating-an-issue" rel="nofollow">http://www.redmine.org/projects/redmine/wiki/Rest_Issues#Creating-an-issue</a></p>
  
  <p>I try send json via post method. (using postman -plugin for chrome)
  <br>Post query: [my-domain]/redmine/issues.json</p>
  
  <pre><code>{
    "issue": {
      "project_id": 1,     // my project has different number.
      "subject": "Example",
      "priority_id": 4
    }
  }
  </code></pre>
  
  <p>as a result it gaves me 404 I cant understand why.</p>
  
  <p>I tried also use this query for post method<br>
  my-domain/redmine/projects/[my-project-name]/issues.xml</p>
  
  <p>result: 
  Subject can't be blank ---- but i gave it subject title!!</p>
  
  <p>I dont know what to do.</p>