Updating the host docs to reflect v5 changes.

Also pulled the assembly scanning info into a seprate doc.
Fixed a few spelling mistakes
Clarified which assemblies get included by default
Fixed typos and clarified the assembly scanning process.
Adding asm scanning to TOC
fix file name
fix url
Added msmq config for v4/5 to snippets
WIP fixing the structure of the doc
Put V5/4 first, V3 later
Added snippets related to msmq transport conif
Added missing snippets for v4. Reorganized the doc.
Added missing csproj files
Fixed snippet names to match John's convention in multi-version snippets
Merge pull request #438 from Particular/fix-msmqtransportconfig

Review & fix msmqtransportconfig doc wrt 5.0
fix case
Updated the snippet references to still use old, not tabbed, view
Update multi-transport-support.md

Added a note to make sure SC is already installed
Added code snippet for v5 endpoint customization and moved the nsb v3 and v4 section for customization above logging.
Included the v5 suffix for the AsAClientEquivalent snippet.