ILMerging logary - trying a few different options

See:

 1. ILRepack cecil bug - https://github.com/gluck/il-repack/issues/65
 1. ILRepack mono bug - https://github.com/gluck/il-repack/issues/68
 1. Thread prompting this PR - https://github.com/EventStore/EventStore/issues/255
 1. Corresponding logary github issue - https://github.com/logary/logary/issues/49

Rationale: sometimes is can be hard, and other times it can be impossible, to properly manage frequently-used library references when your code-base grows and you get more and more users.

As a part of getting logary more widely adopted, I want to cut back on the number of dependencies the project is forced to take. Hence this work.