* Avoid pruning paths with find
find . -path foo -path bar -path baz is horrifically inefficient;
properly excluding all of FirebaseAuth without excluding
Firestore/Source/Auth ends up taking 1.5 minutes on my machine.
Deleting via sed is much faster.
* Allow a branch name or filenames to be specified on the command line
e.g. ./scripts/style.sh master formats only files changed since master.
* Format Firebase/Source/Auth code
* Use alternate delimeter for path regexen