git: Add a couple aliases

* git prp - pull rebase purge old remote branches locally
* git sweep - remove local branches that have been merged

gitconfig.versioned

@@ -29,6 +29,7 @@
 	pa = "!f(){ git pull --ff-only \"$@\" && git submodule update --init --recursive; }; f"
 	permission-reset = "!git diff -p -R | grep -E \"^(diff|(old|new) mode)\" | git apply"
 	pr = pull --rebase
+	prp = pull --rebase --prune
 	ps = push --recurse-submodules=check
 	restore = checkout --
 	sd = "!f(){ date=$(date \"+%Y-%m-%dT%H:%M:%S%z\") && git stash save \"$date $@\"; }; f"
@@ -40,6 +41,7 @@
 	sti = status --ignored
 	sts = status --short --branch
 	su = submodule update
+	sweep = "!git branch --merged | grep -v '\\*\\|master\\|develop' | xargs -n 1 git branch -d"
 	ta = tag -a
 	ts = tag -s
 	unstage = reset HEAD --