[skip travis] adding automerge support

basically copying content of youtube_dl folder to youtube_dlc and excluding the youtube_dl folder when compiling

youtube_dl/extractor/__init__.py

@@ -0,0 +1,46 @@
+from __future__ import unicode_literals
+
+try:
+    from .lazy_extractors import *
+    from .lazy_extractors import _ALL_CLASSES
+    _LAZY_LOADER = True
+except ImportError:
+    _LAZY_LOADER = False
+    from .extractors import *
+
+    _ALL_CLASSES = [
+        klass
+        for name, klass in globals().items()
+        if name.endswith('IE') and name != 'GenericIE'
+    ]
+    _ALL_CLASSES.append(GenericIE)
+
+
+def gen_extractor_classes():
+    """ Return a list of supported extractors.
+    The order does matter; the first extractor matched is the one handling the URL.
+    """
+    return _ALL_CLASSES
+
+
+def gen_extractors():
+    """ Return a list of an instance of every supported extractor.
+    The order does matter; the first extractor matched is the one handling the URL.
+    """
+    return [klass() for klass in gen_extractor_classes()]
+
+
+def list_extractors(age_limit):
+    """
+    Return a list of extractors that are suitable for the given age,
+    sorted by extractor ID.
+    """
+
+    return sorted(
+        filter(lambda ie: ie.is_suitable(age_limit), gen_extractors()),
+        key=lambda ie: ie.IE_NAME.lower())
+
+
+def get_info_extractor(ie_name):
+    """Returns the info extractor class with the given ie_name"""
+    return globals()[ie_name + 'IE']