[tubitv] Fix extraction

[remitamine]

tubitv now uses Stanford Javascript Crypto Library to decrypt the apu.
this is the part to extract the decryption information.

diff --git a/youtube_dl/extractor/tubitv.py b/youtube_dl/extractor/tubitv.py
index 6d78b5d..033c5ec 100644
--- a/youtube_dl/extractor/tubitv.py
+++ b/youtube_dl/extractor/tubitv.py
@@ -2,6 +2,7 @@
 from __future__ import unicode_literals

 import codecs
+import base64
 import re

 from .common import InfoExtractor
@@ -67,6 +68,13 @@ class TubiTvIE(InfoExtractor):
             'video:duration', webpage, 'duration'))

         apu = self._search_regex(r"apu='([^']+)'", webpage, 'apu')
+        def _xor(a, b):
+            c = ''
+            for d in range(len(b)):
+                c += chr(ord(b[d]) ^ ord(a[d % len(a)]))
+            return c
+        _l = apu.split('&')
+        sjcl = self._parse_json(_xor(_l[0], base64.b64decode(_l[1]).decode()), video_id)
         m3u8_url = codecs.decode(apu, 'rot_13')[::-1]
         formats = self._extract_m3u8_formats(m3u8_url, video_id, ext='mp4')

the decryption information(sjcl) looks like:

{"iv":"b4pG0hbUv1AqXWmRc3Wt0Q==","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"jQebi0J5Gz4=","ct":"aQ46lVNvulftOWEppEMXW20U8OZUaIJgXMSDwcC3XgyOSFUoRZ72YPXI0EZs5VoD+zRBVJQ3VnoYIEjsDJ+soHpc3JqZjYSawp8Ndynr62d/do2ec/p0DO1VTZPNRNm035iGWiSlpc3qDWSB"}

as i know youtube-dl doesn't support CCM mode.