As a dev I want to be able remotely update git slackin

[James-Firth]

Should respond to update from managers and git pull and kill its own process so it will restart (assuming it's running with forever or something similar)

EDIT: This partially works but these features are still in the todo list:

• install new dependencies after the pull
• be able to pull from a non-master branch via command eg @GitSlackin update development
• function if there's local changes (needs to be tested but should work)

[James-Firth]

I'd also like it to:

• install new dependencies after the pull
• be able to pull from a non-master branch via command eg @GitSlackin update development