Tweaks to jspricke's level improvements

Especially, introduce a better way to count branches

levels/time-machine/branch-create

@@ -27,7 +27,7 @@ git checkout HEAD~1
 
 [win]
 
-NUM_BRANCHES="$(git branch -a | wc -l)"
+NUM_BRANCHES="$(git show-ref --heads | wc -l)"
 test "$NUM_BRANCHES" -ge 3
 
 [congrats]

levels/time-machine/files-delete

@@ -11,7 +11,7 @@ cards = checkout commit-auto reset-hard file-new file-delete
 echo Very smelly socks. > socks
 echo A tiny couch table. > table
 echo An empty energy drink can. > can
-echo An empty bag of chips. > bag
+echo An empty bag of chips. > bag_of_chips
 git add .
 git commit -m "weekend"