Remove broken auto-naming of resting_screen_handler

The automatic naming of the resting_screen_handler wasn't working (error
occured if no name was supplied)

Added test case for the function

mycroft/skills/core.py

@@ -460,13 +460,11 @@ class SkillGUI:
         self.show_page("SYSTEM_UrlFrame.qml", override_idle)
 
 
-def resting_screen_handler(name=None):
+def resting_screen_handler(name):
     """ Decorator for adding a method as an resting screen handler.
 
         If selected will be shown on screen when device enters idle mode
     """
-    name = name or func.__self__.name
-
     def real_decorator(func):
         # Store the resting information inside the function
         # This will be used later in register_resting_screen

test/unittests/skills/test_core.py

@@ -27,7 +27,7 @@ from mycroft.messagebus.message import Message
 from mycroft.skills.skill_data import load_regex_from_file, load_regex, \
     load_vocab_from_file, load_vocabulary
 from mycroft.skills.core import MycroftSkill, load_skill, \
-    create_skill_descriptor, open_intent_envelope
+    create_skill_descriptor, open_intent_envelope, resting_screen_handler
 
 from test.util import base_config
 
@@ -56,6 +56,21 @@ class MockEmitter(object):
         self.results = []
 
 
+class FunctionTest(unittest.TestCase):
+    def test_resting_screen_handler(self):
+        class T(MycroftSkill):
+            def __init__(self):
+                self.name = 'TestObject'
+
+            @resting_screen_handler('humbug')
+            def f(self):
+                pass
+
+        test_class = T()
+        self.assertTrue('resting_handler' in dir(test_class.f))
+        self.assertEquals(test_class.f.resting_handler, 'humbug')
+
+
 class MycroftSkillTest(unittest.TestCase):
     emitter = MockEmitter()
     regex_path = abspath(join(dirname(__file__), '../regex_test'))