Let esphomeyaml know about class inheritance (#229)

* Allow overriding setup priority

* Add inheritance tree

* Global variables

* Tests and better validation

* Fix

* Lint

esphomeyaml/components/esp32_ble_tracker.py

@@ -1,19 +1,26 @@
 import voluptuous as vol
 
 from esphomeyaml import config_validation as cv
+from esphomeyaml.components import sensor
 from esphomeyaml.const import CONF_ID, CONF_SCAN_INTERVAL, ESP_PLATFORM_ESP32
 from esphomeyaml.core import HexInt
-from esphomeyaml.helpers import App, Pvariable, add, esphomelib_ns, ArrayInitializer
+from esphomeyaml.helpers import App, Pvariable, add, esphomelib_ns, ArrayInitializer, \
+    setup_component, Component
 
 ESP_PLATFORMS = [ESP_PLATFORM_ESP32]
 
 CONF_ESP32_BLE_ID = 'esp32_ble_id'
-ESP32BLETracker = esphomelib_ns.ESP32BLETracker
+ESP32BLETracker = esphomelib_ns.class_('ESP32BLETracker', Component)
+XiaomiSensor = esphomelib_ns.class_('XiaomiSensor', sensor.Sensor)
+XiaomiDevice = esphomelib_ns.class_('XiaomiDevice')
+XIAOMI_SENSOR_SCHEMA = sensor.SENSOR_SCHEMA.extend({
+    cv.GenerateID(): cv.declare_variable_id(XiaomiSensor)
+})
 
 CONFIG_SCHEMA = vol.Schema({
     cv.GenerateID(): cv.declare_variable_id(ESP32BLETracker),
     vol.Optional(CONF_SCAN_INTERVAL): cv.positive_time_period_milliseconds,
-})
+}).extend(cv.COMPONENT_SCHEMA.schema)
 
 
 def make_address_array(address):
@@ -27,5 +34,7 @@ def to_code(config):
     if CONF_SCAN_INTERVAL in config:
         add(ble.set_scan_interval(config[CONF_SCAN_INTERVAL]))
 
+    setup_component(ble, config)
+
 
 BUILD_FLAGS = '-DUSE_ESP32_BLE_TRACKER'