LFS support?

It looks like git-remote-dropbox doesn't support LFS. When I tried it I got the following message:

```
Remote "origin" does not support the Git LFS locking API. Consider disabling it with:
$ git config lfs.https://dropbox////[REPO_NAME].git/info/lfs.locksverify false
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
Uploading LFS objects: 0% (0/100), 0 B | 0 B/s, done.
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
...
```

Even after running that command I still get:

```
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
Uploading LFS objects: 0% (0/100), 0 B | 0 B/s, done.
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
batch request: ssh: Could not resolve hostname dropbox: nodename nor servname provided, or not known: exit status 255
...
```

Is this expected to work with LFS?

Start by reproducing the reported Git LFS failure with git-remote-dropbox and a repository containing LFS objects. The issue does not name files or describe the expected implementation, so first read the remote-helper entry point and confirm with maintainers whether the goal is LFS support or documenting that it is unsupported. Done means the project has an agreed behavior for Git LFS.

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