petems / tugboat / 955

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travis-ci

Adds porcelain option to droplets command

* Easier output for things like sed, awk and cut
* Example from `tugboat droplets | grep -F TEST | cut -d : -f 2 | cut -d ' ' -f 2 | cut -d , -f 1 >>big-test-hosts`
* This would now be accomplished with something as easy as:
```
bundle exec tugboat droplets --attribute=ip4
test-blog-1,41.101.11.22
test-blog-2,138.68.11.22
```

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