provide a service to auto apply boundation updates

[balupton]

it would be nice if boundation.bevry.me had a service, which one could login via github into, see all their repos, sorted by those with boundation run on them last as first, and then buttons to run boundation on them

the process from here I am unsure about, but it could be something like:

1. submit a PR with the changes boundation applied, as well as a minor version bump, and changelog entry - with the changelog entry being inside the PR description, and the changelog entry title being the title of the PR
2. the user can then review the PR, and if all good, merge it, then create a release via github with the PR's title and description (which coincide with the changelog's)

The reason this can't be entirely automated is that travis ci has limits on how often it can be interacted with via the API, and boundation needs to set travis environment variables

[balupton]

plan is to do bevry-labs/terraform-scaleway-hashistack#15 and then have this done ontop of it