+ Original lines stated that sending a emoji wrapped in colon will not be parsed, but that was incorrect; replaced with reactions instead of sending messages as the example

Should fix issues in audit logs when deserializing overwrites and
similar types which we use a custom contract resolver for.

Nullable<T> is not valid for Attributes, this is my suggested fix.

* Initial commit

* Add alternative suggestion

* Fix typo

* Update README.md

Added some miscellaneous missing xmldocs

Added some class summaries

Added second sample for adding reactions

Added some REST documentation

* Don't attempt instantiation of an abstract module
* Attempt associating a TypeReader in case one is registered late (ie. OnModuleBuilding)

...because it isn't a class.