ship init does not work with Gitlab URL

[areed]

Expected behavior

ship init https://gitlab.com/charts/gitlab should not create an empty project

Actual behavior

ship init https://gitlab.com/charts/gitlab creates an empty project

Information

• Command line run:

https://kubernetes.slack.com/archives/CFFKXV0JZ/p1560780271024900

$ ship init https://gitlab.com/charts/gitlab/tree/master
Reading https://gitlab.com/charts/gitlab/tree/master ...
Determining application type ...
Attempting to retrieve upstream https://gitlab.com/charts/gitlab/tree/master ...
Detected application type k8s
Looking for ship.yaml ...
ship.yaml not found in upstream, generating default lifecycle for application ...
Open browser to continue? (Y/n) y

       Opening console at http://localhost:8800 ...

Steps to reproduce the behavior

1. ship init https://gitlab.com/charts/gitlab/tree/master

[laverya]

@areed ship init git::https://gitlab.com/charts/gitlab/ works - we just need the git:: annotation for go-getter.

If GitLab follows the same URL schema as GitHub does, we should add handling for that though (parsing /tree/master/bin as using ref=master and within subdir=/bin)