Update Travis CI configuration
Update Travis CI configuration

* Get Travis CI to run the tests using Node.js 0.8 and 0.10.

* Remove redundant `npm install` as Travis does this before every job.

* Have Travis install Bower and Flight's client-side dependencies before
  each job. We're actually testing against the versions specified in the
  `bower.json` now.

giuseppeg/flight,robertknight/flight,icecreamliker/flight,margaritis/flight,icecreamliker/flight,Shinchy/flight,flightjs/flight,KyawNaingTun/flight,robertknight/flight,joelbyler/flight,flightjs/flight,david84/flight,david84/flight,joelbyler/flight,KyawNaingTun/flight,Shinchy/flight