Fix link stage
Fix Win32 build
Merge branch 'master' into plugins

Conflicts:
	lunchbox/CMakeLists.txt
Plugin code improvements for Equalizer porting to new #18 API:
* Add new down/uploader classes derived from eq::util::GPUCompressor
* Implement visitor pattern for PluginRegistry->Plugin
* Implement generic setZero() (aka bzero/memset)
* Create EqCompressorInfo ostream operator