[Vim] Remap gS and gJ

I missed being able to access the original function of J reliably. We
have to disable the default splitjoin.vim maps as they interfere with
our own.
[Vim] Template system with Projectionist/UltiSnips
[Emacs] Fix Org src block snippet
[Vim] Install new text-objects, git-gutter
[Vim] Styx.vim: Unlink SpecialKey and NonText