Discontinuity parsing test

Add an example m3u8 with discontinuities and the correct parsed JSON.

+{
+  "allowCache": true,
+  "mediaSequence": 0,
+  "segments": [
+    {
+      "duration": 10,
+      "uri": "001.ts"
+    },
+    {
+      "duration": 19,
+      "uri": "002.ts"
+    },
+    {
+      "discontinuity": true,
+      "duration": 10,
+      "uri": "003.ts"
+    },
+    {
+      "duration": 11,
+      "uri": "004.ts"
+    },
+    {
+      "discontinuity": true,
+      "duration": 10,
+      "uri": "005.ts"
+    },
+    {
+      "duration": 10,
+      "uri": "006.ts"
+    },
+    {
+      "duration": 10,
+      "uri": "007.ts"
+    },
+    {
+      "discontinuity": true,
+      "duration": 10,
+      "uri": "008.ts"
+    },
+    {
+      "duration": 16,
+      "uri": "009.ts"
+    }
+  ],
+  "targetDuration": 19,
+  "endList": true
+}

+#EXTM3U
+#EXT-X-VERSION:3
+#EXT-X-TARGETDURATION:19
+#EXT-X-MEDIA-SEQUENCE:0
+#EXTINF:10,0
+001.ts
+#EXTINF:19,0
+002.ts
+#EXT-X-DISCONTINUITY
+#EXTINF:10,0
+003.ts
+#EXTINF:11,0
+004.ts
+#EXT-X-DISCONTINUITY
+#EXTINF:10,0
+005.ts
+#EXTINF:10,0
+006.ts
+#EXTINF:10,0
+007.ts
+#EXT-X-DISCONTINUITY
+#EXTINF:10,0
+008.ts
+#EXTINF:16,0
+009.ts
+#EXT-X-ENDLIST