CLI Configuration support

[nesquena]

You should be able to set polling interval, notifications, etc for a repo using the cli?

gitdocs config polling.interval --set 5
gitdocs config polling.interval
gitdocs config polling.interval --global
gitdocs config -l # list all?

[acant]

I would like to add this at some point, but for now I'm going to take it out of a particular milestone.