Add git options for each forgit command

[carlfriedrich]

Check list

• [x] I have performed a self-review of my code
• [x] I have commented my code in hard-to-understand areas
• [x] I have made corresponding changes to the documentation

Description

The git behavior within forgit can now be customized via dedicated variables for each forgit command, e.g. FORGIT_ADD_GIT_OPTS is passed to the git add call within ga.

This should make #277 obsolete.

Type of change

• [ ] Bug fix
• [x] New feature
• [ ] Refactor
• [ ] Breaking change
• [ ] Documentation change

Test environment

• Shell
  • [x] bash
  • [ ] zsh
  • [ ] fish
• OS
  • [x] Linux
  • [ ] Mac OS X
  • [ ] Windows
  • [ ] Others:

[sandr01d]

Works as expected :+1:

[carlfriedrich]

Seems like I merged this a bit too early. :-( Rebasing does not work anymore now:

fatal: invalid upstream ''

Already preparing a PR to fix this.