* Use test.Repo and AddCommits to set up complex multi-branch tests
* Can commit in the past for history tests, branch, merge and tag
* Can generate random data for files or use what you give it
* Returns full detail of the commits created including SHAs and OIDs
* Can pipe JSON from a batch file into lfstest-testutils to get the same
functionality in acceptance tests
* get_date bash util to create commit dates easily on BSD/Mac and GNU
* see test-push.sh for bash example and scanner_git_test.go for go test
This removes the `pb` based progress bar for the transfer queue and add
a simpler custom bar. pb really wants to know total counts and byte
sizes up front but when doing batches of n we would prefer to not know
that. This is due to the fact that the batcher will block until it is
drained instead of processing all pointers and storing them in memory
while transfer operations run. This also clarifies when files are
skipped because the server already has them. Progress output here
contains the number of finished transfers/bytes, the number of
transfers/bytes currently in the queue, and the number of files skipped,
if any.
