ext: Change entry point from 'mopidy.extension' to 'mopidy.ext' to be more consistent

docs/extensiondev.rst

@@ -126,7 +126,7 @@ the PyPI registration.
 
 The package must have ``install_requires`` on ``setuptools`` and ``Mopidy``, in
 addition to any other dependencies required by your extension. The
-``entry_points`` part must be included. The ``mopidy.extension`` part cannot be
+``entry_points`` part must be included. The ``mopidy.ext`` part cannot be
 changed, but the innermost string should be changed. It's format is
 ``ext_name = package_name:Extension``. ``ext_name`` should be a short
 name for your extension, typically the part after "Mopidy-" in lowercase. This
@@ -166,7 +166,7 @@ class that will connect the rest of the dots.
             'pysoundspot',
         ],
         entry_points={
-            b'mopidy.extension': [
+            b'mopidy.ext': [
                 'soundspot = mopidy_soundspot:Extension',
             ],
         },

mopidy/__main__.py

@@ -130,7 +130,7 @@ def check_old_folders():
 
 def load_extensions():
     extensions = []
-    for entry_point in pkg_resources.iter_entry_points('mopidy.extension'):
+    for entry_point in pkg_resources.iter_entry_points('mopidy.ext'):
         logger.debug('Loading extension %s', entry_point.name)
 
         # TODO Filter out disabled extensions

setup.py

@@ -44,7 +44,7 @@ setup(
             'mopidy = mopidy.__main__:main',
             'mopidy-scan = mopidy.scanner:main',
         ],
-        b'mopidy.extension': [
+        b'mopidy.ext': [
             'http = mopidy.frontends.http:Extension [http]',
             'lastfm = mopidy.frontends.lastfm:Extension [lastfm]',
             'local = mopidy.backends.local:Extension',