[rule34vault] Added initial support for rule34vault.com

- Added playlists support for rule34vault
- Added support for posts in rule34vault
- Fixed supported sites with script
- Fixed posts pattern in rule34vault
- Added tests for rule34vault
- Clean
- Fixed lint warnings

scripts/supportedsites.py

@@ -119,6 +119,7 @@ CATEGORY_MAP = {
     "rule34"         : "Rule 34",
     "rule34hentai"   : "Rule34Hentai",
     "rule34us"       : "Rule 34",
+    "rule34vault"    : "R34 Vault",
     "sankaku"        : "Sankaku Channel",
     "sankakucomplex" : "Sankaku Complex",
     "seiga"          : "Niconico Seiga",