Improve linux support.
When exploding a bottle, write the version file regardless of whether it contains any resources
Merge pull request #81 from alistairc/version-empty-folders

Allow deployment in read only environment
Use ILRepack instead if ILMerge.  Fixes bug when running on .net 4.0
cleaning up the unnecessary assemblies in BottleServiceRunner's nuspec.  Closes GH-80
Merge pull request #82 from alistairc/ilrepack

ILRepack
Merge pull request #79 from alistair/linux_improvements

improve linux support for build and gem install.