Change 'Git Pull Request' generation mapping `@r` -> `@p`
Remove 'Toggle relative numbers' from config and from README

I almost never use them. I use Vim-Easymotion instead. But this function
holds mapping that can be used elsewhere.
Disable save() hotkey in gitcommit file

If you accidently save :Gstatus buffer, the git index file got corrupted
Git Conflict Resolution View and README

* `,,r` - Open Conflict Resolution view for current file
Opens current file in new tab, shows HEAD version, conflicted MERGE
version, and "both modified" version of the file.