Allow external scripts to be retrieved from personnal git repositories via HTTP(S)

[Neonox31]

You can now specify git+http or git+https urls as a script in the EXTERNAL_SCRIPTS env variable.
Useful when user doesn't want to publish his script on the public NPM registry.

Ex : -e EXTERNAL_SCRIPTS=hubot-pugme,hubot-help,git+https://user:token@repo/hubot-ping.git

/cc @davinkevin

[geekgonecrazy]

I'll take a closer look. But this looks like it easily does the job.

I'm kind of thinking of at some point adding a proper nodejs script in the container so more like this can be done.

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✅ engelgabriel
❌ WEBER Logan

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