Ingest bundles
style changes

rename archiveToer -> archiverTo
simplify building reordered BranchTip slice
Merge branch 'v4' of github.com:juju/charmstore into ingest-bundles

Conflicts:
	lppublish/lpad.go
add TODO improve/add control of memory usage
extract notSupportedBranchName function
Merge branch 'v4' of github.com:juju/charmstore into ingest-bundles

Conflicts:
	lppublish/lpad.go
Merge pull request #110 from jrwren/ingest-bundles

Ingest bundles