already evaluated:
- all external continuous integration sites fail to provide win/linux/osx support in some way, so there is no way around a self-hosted compile farm

current options:

1) github
- advantage: popular

2) gitlab
- same as github, but less popular?

3) gitlab, self-hosted
- disadvantage: custom user-management again
- potential advantage: could patchpacks use our compile farm out-of-the-box?
- to evaluate: difference in feature-set between self-hosted and non-self-hosted

4) bitbucket, self-hosted
- go the full atlassian route with jira and confluence? ... meh imho