[test] tell Travis to install rtmpdump and add initial support to rtmp testing

Use the 'extractor_key' field for the download archive file

.travis.yml

@@ -3,6 +3,9 @@ python:
   - "2.6"
   - "2.7"
   - "3.3"
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq rtmpdump
 script: nosetests test --verbose
 notifications:
   email:

youtube_dl/YoutubeDL.py

@@ -126,7 +126,7 @@ class YoutubeDL(object):
     noplaylist:        Download single video instead of a playlist if in doubt.
     age_limit:         An integer representing the user's age in years.
                        Unsuitable videos for the given age are skipped.
-    downloadarchive:   File name of a file where all downloads are recorded.
+    download_archive:   File name of a file where all downloads are recorded.
                        Videos already present in the file are not downloaded
                        again.
     cookiefile:        File name where cookies should be read from and dumped to.
@@ -837,7 +837,7 @@ class YoutubeDL(object):
     def _make_archive_id(self, info_dict):
         # Future-proof against any change in case
         # and backwards compatibility with prior versions
-        extractor = info_dict.get('extractor')
+        extractor = info_dict.get('extractor_key')
         if extractor is None:
             if 'id' in info_dict:
                 extractor = info_dict.get('ie_key')  # key in a playlist

youtube_dl/extractor/cinemassacre.py

@@ -12,27 +12,21 @@ class CinemassacreIE(InfoExtractor):
     _TESTS = [{
         u'url': u'http://cinemassacre.com/2012/11/10/avgn-the-movie-trailer/',
         u'file': u'19911.flv',
+        u'md5': u'f9bb7ede54d1229c9846e197b4737e06',
         u'info_dict': {
             u'upload_date': u'20121110',
             u'title': u'“Angry Video Game Nerd: The Movie” – Trailer',
             u'description': u'md5:fb87405fcb42a331742a0dce2708560b',
-        },
+        }
-        u'params': {
-            # rtmp download
-            u'skip_download': True,
-        },
     },
     {
         u'url': u'http://cinemassacre.com/2013/10/02/the-mummys-hand-1940',
         u'file': u'521be8ef82b16.flv',
+        u'md5': u'9509ee44dcaa7c1068604817c19a9e50',
         u'info_dict': {
             u'upload_date': u'20131002',
             u'title': u'The Mummy’s Hand (1940)',
-        },
+        }
-        u'params': {
-            # rtmp download
-            u'skip_download': True,
-        },
     }]
 
     def _real_extract(self, url):

youtube_dl/extractor/videopremium.py

@@ -9,12 +9,10 @@ class VideoPremiumIE(InfoExtractor):
     _TEST = {
         u'url': u'http://videopremium.tv/4w7oadjsf156',
         u'file': u'4w7oadjsf156.f4v',
+        u'md5': u'e51e4a266aab7531c6ac06f4ffee3b0d',
         u'info_dict': {
             u"title": u"youtube-dl_test_video____a_________-BaW_jenozKc.mp4.mp4"
-        },
+        }
-        u'params': {
-            u'skip_download': True,
-        },
     }
 
     def _real_extract(self, url):