1.2.7.1: Spotify-related improvements, FreeBSD support

hotfix(oomoxify): revise polkit detection
2017-07-17 c11b9e3 Yauhen Kirylau feat(oomoxify, PKGBUILD): add polkit support
2017-06-13 1a792d3 Youri Wijnands Use pacaur for AUR downloads
2017-06-11 6d2f45e Yauhen Kirylau style(gui: export): formatting
2017-06-11 a18efae Yauhen Kirylau feat(gui: export; oomoxify): add option to use custom font
2017-06-11 317fc81 Yauhen Kirylau feat(gui: export): increase timeout for longer types of exports
2017-06-11 559a6d4 Yauhen Kirylau feat(gui: export: oomoxify): add option to use system sans font
2017-06-11 6ade634 Yauhen Kirylau fix(oomoxify): typo in font-family attr
2017-05-28 98ffa1d Yauhen Kirylau feat(oomoxify): replace blue color to BTN_BG
2017-05-24 a8647d3 Yauhen Kirylau fix(readme): mention minimum required versions of libsass and gtk3
2017-05-04 b60a236 Hannes Hauswedell [FIX] make compatible with non-Linux (tested on FreeBSD)