Add Text Sensors (#166)

* Text Sensors

* Add version text sensor

* Fix

* Fixes

* Add tests

* Add template text sensor

* Lint

* Fix test

esphomeyaml/components/text_sensor/mqtt_subscribe.py

@@ -0,0 +1,27 @@
+import voluptuous as vol
+
+from esphomeyaml.components import text_sensor
+import esphomeyaml.config_validation as cv
+from esphomeyaml.const import CONF_MAKE_ID, CONF_NAME, CONF_QOS, CONF_TOPIC
+from esphomeyaml.helpers import App, Application, add, variable
+
+DEPENDENCIES = ['mqtt']
+
+MakeMQTTSubscribeTextSensor = Application.MakeMQTTSubscribeTextSensor
+
+PLATFORM_SCHEMA = cv.nameable(text_sensor.TEXT_SENSOR_PLATFORM_SCHEMA.extend({
+    cv.GenerateID(CONF_MAKE_ID): cv.declare_variable_id(MakeMQTTSubscribeTextSensor),
+    vol.Required(CONF_TOPIC): cv.subscribe_topic,
+    vol.Optional(CONF_QOS): cv.mqtt_qos,
+}))
+
+
+def to_code(config):
+    rhs = App.make_mqtt_subscribe_text_sensor(config[CONF_NAME], config[CONF_TOPIC])
+    make = variable(config[CONF_MAKE_ID], rhs)
+    if CONF_QOS in config:
+        add(make.Psensor.set_qos(config[CONF_QOS]))
+    text_sensor.setup_text_sensor(make.Psensor, make.Pmqtt, config)
+
+
+BUILD_FLAGS = '-DUSE_MQTT_SUBSCRIBE_TEXT_SENSOR'