wip: heroku: use buildpack social-snippet/heroku-buildpack-nodejs.git
wip: heroku: use heroku-buildpack-apt#custom/1412644752
wip: heroku: use heroku-buildpack-nodejs#custom/1412646969
wip: git: ignore npm-debug.log
wip: assets: fix app_router path
wip: heroku: disuse branch name in .buildpacks
wip: rubygems: use social_snippet#feature/registry-client
wip: rubygems: use rugged with libgit2
wip: rubygems: use social-snippet#wip/registry-client
wip: apt: use libgit2
wip: rubygems: remove rugged
wip: heroku: change build order
wip: heroku: use heroku-buildpack-libgit2