This makes it possible to include/exclude multiple directories when rolling src into a vendor directory.
For example, to roll the `cmd` and `go` directories from github.com/attic-labs/noms
into your vendor directory, you could run the following:
```
cd $MY_REPO_HOME
$NOMS/tools/roll.py --incl cmd --incl go https://github.com/attic-labs/noms
```
This patch also strips '.git' if it's present on the end of the repo url.
If you want to roll just the go/ directory of noms, you can do:
$ roll.py https://github.com/attic-labs/noms --incl go
If you want to roll the AWS SDK without the tests, you can do:
$ roll.py https://github.com/aws/aws-sdk-go --excl awstesting
This works with nested directories too, for example --incl go/util
--excl is evaluated after --incl, so you could exclude the perf/
directory of go/ if you really wanted:
$ roll.py https://github.com/attic-labs/noms --incl go --excl go/perf
Eric Halpern