Deploy command fails on non-git repos.

[BioBox]

Describe the bug
Unfortunately, it seems like the mbed website allows non-git repos and the deploy command assumes that they are all git.

To Reproduce
Steps to reproduce the behavior:

1. Create a new project.
2. Add https://os.mbed.com/users/romilly/code/MCP23S17/#068b1e8909bb to a .lib file.
3. Run mbedtools deploy

Expected behavior
The repository is cloned into the current directory.

Current behavior
The command fails because this is a mericurial repository, not a git one.

Cloning into '#068b1e8909bb'...
fatal: https://os.mbed.com/users/romilly/code/MCP23S17/#068b1e8909bb/info/refs not valid: could not determine hash algorithm; is this a git repository?

Solving the Problem

We need a way to tell what version control system a project is using and select the appropriate tool.
Or just wipe all these projects off the site, that works too 😈