v0.4.7

NetworkLayout v0.4.7

Diff since v0.4.6

Merged pull requests:

• store RNG instead of seed in iterative layouts (#65) (@hexaeder)
• fix rng pr (#70) (@hexaeder)

Closed issues:

• buchheim layout overlaping (#60)
• how to take up whole plot space (#61)
• Spring layout for directed graphs - (#66)