Write Compiler class

[njgheorghita]

What was wrong?

#1

How was it fixed?

For the most part, I followed what was outlined in #1, but added output (i.e. the compiler_output) as an attribute to Compiler, since it falls more in line with how py-ethpm's builder functions are currently designed.

An alternative would be to adjust the builder functions in py-ethpm to support something like

package = b.build(
    {},
    ...,  # initialize basic package meta
    inline_sources(sources),  # inlines all of the sources
    contract_type("Owned", contract_types),  #
)

But I thought this would be a better way to get this working initially

Cute Animal Picture

[njgheorghita]

@pipermerriam pinging for initial review - CI won't pass until pytest-ethereum is released which i'm working on now

[pipermerriam]

Generally 👍

In a subsequent PR, it might be good to start establishing the basic documentation for the API as well so that the way it is intended to be used can begin being defined.

[pipermerriam]

tabs

[pipermerriam]

neat that the builder tool can be used here.

[pipermerriam]

In theory, this function would be a public API which would imply it should live outside of utils (which should be _utils under our new paradigm)

[pipermerriam]

I think this should be a computed property rather than populating it eagerly during initialization. No strong reason other than compilation often being expensive.