add silence removal using pydub and multithreading

+ fix favorites endpoint returning items less than limit
+ add endpoint to remove get silence padding
+ add 'the ulitimate' and 'compilation' to compilation album filters
+ misc

app/lib/pydub/AUTHORS

@@ -0,0 +1,101 @@
+James Robert
+    github: jiaaro
+    twitter: @jiaaro
+    web: jiaaro.com
+    email: pydub@jiaaro.com
+
+Marc Webbie
+    github: marcwebbie
+
+Jean-philippe Serafin
+    github: jeanphix
+
+Anurag Ramdasan
+    github: AnuragRamdasan
+
+Choongmin Lee
+    github: clee704
+
+Patrick Pittman
+    github: ptpittman
+
+Hunter Lang
+    github: hunterlang
+
+Alexey
+    github: nihisil
+
+Jaymz Campbell
+    github: jaymzcd
+
+Ross McFarland
+    github: ross
+
+John McMellen
+    github: jmcmellen
+
+Johan Lövgren
+    github: dashj
+
+Joachim Krüger
+    github: jkrgr
+
+Shichao An
+    github: shichao-an
+
+Michael Bortnyck
+    github: mbortnyck
+
+André Cloete
+    github: aj-cloete
+
+David Acacio
+    github: dacacioa
+
+Thiago Abdnur
+    github: bolaum
+
+Aurélien Ooms
+    github: aureooms
+
+Mike Mattozzi
+    github: mmattozzi
+
+Marcio Mazza
+    github: marciomazza
+
+Sungsu Lim
+    github: proflim
+
+Evandro Myller
+    github: emyller
+
+Sérgio Agostinho
+    github: SergioRAgostinho
+
+Antonio Larrosa
+    github: antlarr
+
+Aaron Craig
+    github: craigthelinguist
+
+Carlos del Castillo
+    github: greyalien502
+
+Yudong Sun
+    github: sunjerry019
+
+Jorge Perianez
+    github: JPery
+
+Chendi Luo
+    github: Creonalia
+
+Daniel Lefevre
+    gitHub: dplefevre
+
+Grzegorz Kotfis
+    github: gkotfis
+
+Pål Orby
+    github: orby