Update subliminal to 2.0.5

Also updates:
- appdirs-1.4.3
- babelfish-0.5.5
- beautifulsoup4-4.6.3
- certifi-2018.11.29
- chardet-3.0.4
- click-7.0
- decorator-4.3.0
- dogpile.cache-0.7.1
- enzyme-0.4.1
- guessit-3.0.3
- idna-2.8
- pbr-5.1.1
- pysrt-1.1.1
- python-dateutil-2.7.5
- pytz-2018.7
- rarfile-3.0
- rebulk-1.0.0
- requests-2.21.0
- six-1.12.0
- stevedore-1.30.0
- urllib3-1.24.1

libs/stevedore/exception.py

@@ -0,0 +1,23 @@
+#  Licensed under the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License. You may obtain
+#  a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#  License for the specific language governing permissions and limitations
+#  under the License.
+
+
+class NoUniqueMatch(RuntimeError):
+    """There was more than one extension, or none, that matched the query."""
+
+
+class NoMatches(NoUniqueMatch):
+    """There were no extensions with the driver name found."""
+
+
+class MultipleMatches(NoUniqueMatch):
+    """There were multiple matches for the given name."""