Reorged imports from jbenet/go-ipfs to ipfs/go-ipfs

- Modified Godeps/Godeps.json by hand
- [TEST] Updated welcome docs hash to sharness
- [TEST] Updated contact doc
- [TEST] disabled breaking test (t0080-repo refs local)

block_generator.go

 package blocksutil
 
-import "github.com/jbenet/go-ipfs/blocks"
+import "github.com/ipfs/go-ipfs/blocks"
 
 func NewBlockGenerator() BlockGenerator {
 	return BlockGenerator{}