chore(travis): trying to support Node 0.11.x (and forthcoming 0.12.x)
chore(package): use empower node-0_11_x branch for testing
chore(package): empower node-0_11_x branch is merged to master
chore(package): empower 0.9.1 is out
Merge pull request #13 from twada/node-0_11_x-support

Support Node 0.11.x (and forthcoming 0.12.x)