title: Can't import FlaskForm from Flask-WTF
body: <p>I have an existing Flask application and am trying to add the Flask-Blogging extension to it. Adding the extension raises <code>ImportError: cannot import name FlaskForm</code> when <code>flask_blogging</code> tries <code>from flask_wtf import FlaskForm</code>.</p>
  
  <pre><code>Traceback (most recent call last):
    File "run.py", line 11, in &lt;module&gt;
      blog_engine = BloggingEngine(app, sql_storage)
    File "/usr/local/lib/python2.7/dist-packages/flask_blogging/engine.py", line 66, in __init__
      self.init_app(app, storage)
    File "/usr/local/lib/python2.7/dist-packages/flask_blogging/engine.py", line 96, in init_app
      from .views import create_blueprint
    File "/usr/local/lib/python2.7/dist-packages/flask_blogging/views.py", line 11, in &lt;module&gt;
      from flask_blogging.forms import BlogEditor
    File "/usr/local/lib/python2.7/dist-packages/flask_blogging/forms.py", line 1, in &lt;module&gt;
      from flask_wtf import FlaskForm
  ImportError: cannot import name FlaskForm
  </code></pre>
  
  <p>I am using Flask 0.11.1 and Flask-WTF 0.12.</p>