[skip travis] renaming

to avoid using same folder when using pip install for example

youtube_dlc/postprocessor/__init__.py

@@ -0,0 +1,40 @@
+from __future__ import unicode_literals
+
+from .embedthumbnail import EmbedThumbnailPP
+from .ffmpeg import (
+    FFmpegPostProcessor,
+    FFmpegEmbedSubtitlePP,
+    FFmpegExtractAudioPP,
+    FFmpegFixupStretchedPP,
+    FFmpegFixupM3u8PP,
+    FFmpegFixupM4aPP,
+    FFmpegMergerPP,
+    FFmpegMetadataPP,
+    FFmpegVideoConvertorPP,
+    FFmpegSubtitlesConvertorPP,
+)
+from .xattrpp import XAttrMetadataPP
+from .execafterdownload import ExecAfterDownloadPP
+from .metadatafromtitle import MetadataFromTitlePP
+
+
+def get_postprocessor(key):
+    return globals()[key + 'PP']
+
+
+__all__ = [
+    'EmbedThumbnailPP',
+    'ExecAfterDownloadPP',
+    'FFmpegEmbedSubtitlePP',
+    'FFmpegExtractAudioPP',
+    'FFmpegFixupM3u8PP',
+    'FFmpegFixupM4aPP',
+    'FFmpegFixupStretchedPP',
+    'FFmpegMergerPP',
+    'FFmpegMetadataPP',
+    'FFmpegPostProcessor',
+    'FFmpegSubtitlesConvertorPP',
+    'FFmpegVideoConvertorPP',
+    'MetadataFromTitlePP',
+    'XAttrMetadataPP',
+]