Added support for building on osx
Updated json protobuf submodule
Merge branch 'master' of https://github.com/mickem/nscp

* 'master' of https://github.com/mickem/nscp:
  * Reworked the dot-net API    Now actually works and is much much improved.  * Change the dotnetplugin.dll name to NSCP.Core.dll  * Removed all "helpers" from the API and added a separate NSCP.Helpers.dll  * All C# code is now built using cmake  * CSharpSample plugin is now included in cmake build  * Added protobuf_net and a compiled proto file to NSCP.Protobuf.dll  * Much bugfixing and tweaks and changes to dot-net plugin  * Change the directory structure of various components to make things easier to find  * Cleaned up the cmake build a bit  * Removed some old stale artifacts  * Changed name of nscapi_plugin_interface.hpp to nscapi_helper_singleton.hpp to better reflect what it is