Remove sleeps. (#5)

* Remove sleeps.

- the sleeps is not needed.

* Make sleep depending on environment variable.

- set QUICKWIZARD to true to disable sleeps.

* Changed env-name and made it work without env.

- It only worked when environment variable was defined. Now it works
  with variable unset, which should be the normal case.
- Added ESPHOMEYAML_ as prefix so it's ESPHOMEYAML_QUICKWIZARD.

esphomeyaml/wizard.py

@@ -3,7 +3,6 @@ from __future__ import print_function
 import codecs
 import os
 import unicodedata
-from time import sleep
 
 import voluptuous as vol
 
@@ -70,6 +69,12 @@ logger:
 
 """
 
+if os.getenv('ESPHOMEYAML_QUICKWIZARD', False):
+    def sleep(time):
+        pass
+else:
+    from time import sleep
+
 
 def print_step(step, big):
     print()