set jaeger-client-go source path and updates vendor

[woodsaj]

fixes #933

[woodsaj]

@Dieterbe when running dep ensure a huge number of new packages have been added to the vendor dir. the diff of Gopkg.lock shows only the intended changes so i am not sure why all of these packages are now needed, or were they just missing previously.

Also running dep ensure removes all of the local changes to gopkg.in/raintank/schema.v1, so i guess we have not merged the schema changes uptream? if that is the case, we should get that done

[Dieterbe]

I have just merged the schema changes raintank/schema#18
we should probably tag this as v2.0 and then it'll be available on gopkg.in as v2 right?

dep is a bit strange. the recent versions of dep are supposed to automatically prune when you run ensure, however I always run dep prune after dep ensure because it usually finds things to clean up, also in this case it worked for me and removed all the extra stuff,
except for some the schema changes which should be fixed once we tag it I think.

go get -u github.com/golang/dep/cmd/dep
dep ensure
dep prune

[woodsaj]

we should probably tag this as v2.0 and then it'll be available on gopkg.in as v2 right?

probably, but lets move that discussion to the raintank/schema repo