Add Bower ignores
Add Bower ignores

Prevent unnecessary files being installed when people install Flight
using Bower.

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