Clean up my #git global config files (much needed)

git/.gitconfig

@@ -5,14 +5,10 @@
 	signingkey = 7B405BE1
 [push]
 	default = current
+[commit]
+	gpgsign = true
 [core]
 	excludesfile = ~/.gitignore_global
-[difftool "sourcetree"]
-	cmd = opendiff \"$LOCAL\" \"$REMOTE\"
-	path = 
-[mergetool "sourcetree"]
-	cmd = /Applications/SourceTree.app/Contents/Resources/opendiff-w.sh \"$LOCAL\" \"$REMOTE\" -ancestor \"$BASE\" -merge \"$MERGED\"
-	trustExitCode = true
 [alias]
 	undo = reset --soft HEAD^
 	stash-all = stash save --include-untracked
@@ -30,8 +26,6 @@
 	hs  = for-each-ref --sort=-committerdate refs/heads/ --format='%(HEAD) %(color:yellow)%(refname:short)%(color:reset) - %(color:red)%(objectname:short)%(color:reset) - %(contents:subject) - %(authorname) (%(color:green)%(committerdate:relative)%(color:reset))'
 [merge]
 	conflictstyle = diff3
-[commit]
-	gpgsign = true
 [pager]
   diff = diff-so-fancy | less --tabs=1,5 -RFX
   show = diff-so-fancy | less --tabs=1,5 -RFX