Make sure ~/go/bin is in the path
Make sure ~/go/bin is in the path

This change is necessary to make the vagrant instructions in the
README.md work correctly.  Without this change, lots of 'make test'
errors due to the fact that golint is installed into ~/go/bin.

ShengjieLuo/pachyderm,sambooo/pachyderm,sambooo/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,ShengjieLuo/pachyderm