Make git settings better

Copy to ~/.gitconfig
====================
[difftool]
    prompt = false
[gitreview]
    remote = origin
[gui]
    fontui = -family Consolas -size 15 -weight normal -slant roman -underline 0 -overstrike 0
    fontdiff = -family Consolas -size 15 -weight normal -slant roman -underline 0 -overstrike 0
[core]
    editor = emacs -nw
    # Remove the windows trailing space diffs
    autocrlf = input
[diff]
    tool = meld
[merge]

    tool = meld