Add approved clients

Approved client is differentiated by green tick by its name on
authorization request page.

auth.py

@@ -8,7 +8,8 @@ from cached_property import cached_property
 import flask
 from flask import Flask, render_template, make_response, flash, redirect, url_for
 from flask_oauthlib.provider import OAuth2Provider
-from flask_login import LoginManager, login_user, login_required, current_user
+from flask_login import LoginManager, login_user, logout_user, \
+    login_required, current_user
 from flask_sqlalchemy import SQLAlchemy
 from flask_wtf import FlaskForm
 from wtforms import StringField, PasswordField
@@ -43,6 +44,8 @@ class Client(db.Model):
     redirect_uris_ = db.Column(db.Text)
     default_scopes_ = db.Column(db.Text)
 
+    approved = db.Column(db.Boolean, default=False)
+
     @property
     def client_type(self):
         if self.is_confidential:
@@ -64,7 +67,7 @@ class Client(db.Model):
         if self.default_scopes_:
             return self.default_scopes_.split()
         return []
-    
+
     def validate_scopes(self, scopes):
         return {'profile:read', 'profile:write', 'password:write', \
                 'users:read'}.issuperset(scopes)

templates/oauthorize.html

@@ -3,7 +3,9 @@
 {% block content %}
   <div class="container" id="authorize-container">
     <center><img src="/static/hswaw_wht.svg" style="width: 50%;"/></center>
-    <h2>{{ client.name }}</h2>
+    <h2>{{ client.name }}
+        {% if client.approved %}<small title="This application is approved."><sup><i class="glyphicon glyphicon-ok-circle text-success"></i></sup></small>{% endif %}
+    </h2>
     <h4>This app would like to:</h4>
     <ul class="list-group">
     {% if 'profile:read' in scopes and 'profile:write' not in scopes %}