Making sure that symbol files are generated correctly

Removed direct file references in nuspec files. Pointing at .csproj files for packing
fixed Nhibernate and Mimir.Web projects to be packageable :)
updated nuget to the latest version
added commonassemblyinfo to the Javascript project for nugetability
Creating Bifrost packages with symbols, and Examples packages without based on .csproj files
uncommented the push nuget packages command