do not use go get to fetch new repositories
do not use go get to fetch new repositories

"go get" always recursively fetches dependencies,
and this feature cannot be disabled. This means that
when godeps used "go get -d" to fetch a repository,
it could fetch unwanted tip dependencies.

R=mattyw, cmars_, martin.hilton
CC=
https://codereview.appspot.com/230460044

cmars/tools,cmars/tools,cmars/tools,cmars/tools