params: release Geth 1.6.0, Puppeth Master

Merge pull request ethereum#3671 from karalabe/1.5.9-stable

params: 1.5.9 stable

params: v1.5.8-stable

params: stable 1.5.7

Merge pull request ethereum#3537 from karalabe/release-1.5.6

params: stable version 1.5.6

Merge pull request ethereum#3440 from karalabe/release-1.5.5

params: stable version 1.5.5

params: stable version 1.5.4 (ethereum#3360)

cmd/utils: 1.5.3 stable

core: Don't perform EIP150 hash check on uncles (ethereum#3303)

Merge pull request ethereum#3278 from obscuren/version-1-5-1

utils: bump stable 1.5.1