fixes incorrect usage of $GOBIN

gobin in this case should *only* point
to the .godeps/bin directory, otherwise you end up with
.godeps /
	bin /
	bin: / <-- where binaries are actually placed by go get

when it should obviously only be in .godeps/bin

also fixed test
Merge pull request #12 from chrsm/fix/correct_gobin

fixes incorrect usage of $GOBIN