Do not include PDB with the main package.
Reason: deployment size 3.5x larger with PDB, while there seem to be no strong cases for really using it from Nuget; Nuget guidelines are for omitting PDB from the main package and optionally publishing the symbols package, http://docs.nuget.org/docs/creating-packages/creating-and-publishing-a-symbol-package.
Turn on XmlDoc in Release mode, this should restore adding it to Nuget package on build.
Fix warning on inconsistent XmlDoc.
Strong name signature to allow the use of this assembly in strong-name-signed projects. Generated a new SNK.