Handle the armed status better

Blink allows users to arm/disarm individual cameras. This is pretty useful for
inside and outside cameras, for instance.

The 'armed' information in the JSON however, merely indicates whether the
*system* is armed, not whether the camera itself is armed. This value, which is
the same as blink.arm, does not indicate whether the camera has motion
detection enabled.

In the JSON, the true status information lies in the 'active' key. The value
can be 'armed', 'disarmed' or 'disabled'. This commit reflects that value
in the armed property.

blinkpy/blinkpy.py

@@ -97,7 +97,7 @@ class BlinkCamera(object):
         self.urls = self.blink.urls
         self.id = str(config['device_id'])  # pylint: disable=invalid-name
         self.name = config['name']
-        self._status = config['armed']
+        self._status = config['active']
         self.thumbnail = "{}{}.jpg".format(self.urls.base_url,
                                            config['thumbnail'])
         self.clip = "{}{}".format(self.urls.base_url, config['video'])
@@ -110,10 +110,15 @@ class BlinkCamera(object):
         self.arm_link = None
         self.region_id = config['region_id']
 
+    @property
+    def status(self):
+        """Return camera status."""
+        return self._status
+
     @property
     def armed(self):
         """Return camera arm status."""
-        return self._status
+        return True if self._status == 'armed' else False
 
     @property
     def battery_string(self):
@@ -143,7 +148,7 @@ class BlinkCamera(object):
     def update(self, values):
         """Update camera information."""
         self.name = values['name']
-        self._status = values['armed']
+        self._status = values['active']
         self.thumbnail = "{}{}.jpg".format(
             self.urls.base_url, values['thumbnail'])
         self.clip = "{}{}".format(