Update Fugitive mappings
Update Fugitive mappings

It's been a really long time since I've used :Gwrite and :Gcommit on its
own -- I either do that from the :Git interface or from the shell. I
simply remove the mappings, then.

Also, updating Gmerge to use Git mergetool.

igemnace/vim-config,igemnace/vim-config,igemnace/vim-config