Refactor analyze/2 to return a Report struct...

[kitplummer]

https://github.com/gtri/lowendinsight/blob/develop/lib/analyzer_module.ex#L13

Need to distinguish between the repo-specific report and the top-level report, which should maybe be Analysis struct.

All the docs will need to be updated, and this is probably something that will need to be deprecated, so adding in as a new function - with deprecation warnings for the current functionality?