Produce Lyra builds (via Travis)

[jdwelch]

Enable and configure Travis to build (and optionally store) builds of Lyra for Linux and macOS

[jdwelch]

#20

[jdwelch]

#26

[ahpook]

I'm gonna remove this from 0.1 - but we do need to come up with a packaging/release strategy.

[scottyw]

In #242 we're changing the build dir structure to support this work:

build
 └─ bin
     └─ lyra
 └─ goplugins
     └─ aws
     └─ puppetdsl
     └─ ...

That aligns with the separation of bin from plugins that we're looking for in brew. We also need workflows and types. Ultimately the brew installation should look like this:

lyra/0.0.1
 └─ bin
     └─ lyra
 └─ goplugins
     └─ aws
     └─ puppetdsl
     └─ ...
 └─ workflows
     └─ aws_pp.pp
     └─ aws.yaml
     └─ ...
 └─ types
     └─ aws.pp
     └─ ...