3.15.91 - "I'm buying him a beer"
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* Register telepathy service to enable use as default channel handler
  [Giovanni; #745418, #745499]
* Misc. bug fixes [Florian; #745203, #743988]

Contributors:
  Giovanni Campagna, Florian Müllner

Translations:
  Yosef Or Boczko [he], Stas Solovey [ru], Cheng-Chia Tseng [zh_TW],
  Daniel Mustieles [es], Tom Tryfonidis [el], Dušan Kazik [sk],
  Rafael Ferreira [pt_BR], Efstathios Iosifidis [el], Daniel Korostil [uk],
  Balázs Úr [hu], Matej Urbančič [sl], Alexandre Franke [fr],
  Fran Dieguez [gl], Milo Casagrande [it], Marek Černocký [cs],
  Мирослав Николић [sr, sr@latin], Piotr Drąg [pl]