v0.13.0

vim integration
gits and remote control gitu/gitd/gits from another program

New features:
- works inside of .git directory
  commit 16dede3812c7540bd2ce178c40d275546d5f23dd
- new executable: gits
  commit ca1ca4ee860a11ebac4b15bcc558b78c5133d901
- new commandline argument --command-pipe
  commit ebd0302da2631dc5a0845844fc81150b297001be
- new setting %app.command-pipe-poll-time%
  commit 6966f9cbd9e408f63a4285f0e447ec9946042471

Bugfixes:
- gitd does not crash anymore
  commit 4d4cf31f11c423bf0d9e42bb5dd5a5b386cb8f8f
  commit e380d41aa7928f208b39dadf81996823c0ddef20
  commit 311e35185f36292c1c697231da45b73470f7ee25
- updated gitu --help: no --wrap anymore
  commit 12f2f473979f1b2137a2ff9475fabacfff37450f
- gitd accepts --config, too
  commit 95493a3cb389d473c3246d065fbc2ff39cd4f9b1