Revert "CLJCLR-25: Allow Clojure.Compile.exe to create single DLL for all compile .clj files"

This reverts commit 7745decbe112241a460580ea479e76e8357e6730.
Modify .gitignore to ignore *.nupkg files.
Add .nuspec file for Clojure
Add clojure/edn to basic compile so ilmerge build has it available
Update assembly versions and Clojure version to 1.5.0
Remove unneeded reference in Csharp.Tests project
Prepare for next development iteration
Merge remote-tracking branch 'upstream/master'