test: add `.travis.yml` for testing on Travis CI
test: add `.travis.yml` for testing on Travis CI

As discussed with @isaacs, build reports will be sent to #libuv IRC
channel. E-mail notifications are turned off so that Travis doesn't
bother committers about failures in forks.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node