Support NUGET

Install-Package ogg-msvc14-x64
Install-Package ogg-msvc14-x86

REF: #24
https://www.nuget.org/packages/ogg-msvc14-x64
https://www.nuget.org/packages/ogg-msvc14-x86

[rillian]

CMake seems to have support for building nuget packages. Would that as well? Having fewer configuration files to maintain would help.