Don't test Node.js 0.8 on Travis
Don't test Node.js 0.8 on Travis

nock doesn't support 0.8 due to use of `setImmediate`:
https://github.com/pgte/nock/commit/09f9289ef878c0db5e9951399af9f928a8748f19

Closes https://github.com/KenanY/backpack.tf/pull/6

KenanY/backpack.tf,NerdDiffer/backpack.tf