Enhance augeas to be a reformatter

This project would include creating a bear to do simple roundtrip checks, but then also use augeas more creatively to reformat a file using a consistent layout (but likely not configurable due to the way augeas works).

- https://github.com/coala/coala-bears/issues/2115
- https://github.com/hercules-team/augeas/issues/352

Semi-related is https://github.com/coala/coala-bears/issues/2062

Start by reading the linked coala-bears issue #2115 and Augeas issue #352, then review the related coala-bears issue #2062. Clarify whether the goal is a bear for simple round-trip checks, a reformatter using Augeas, or both. The issue does not yet define a concrete entry point or completion criteria.

Written by the indexing model from the issue text.