title: luarocks install local source
body: <p>I am making edits to a file in the nn Library.  It has a rockspec file.  When I luarocks install that rockspec file, it downloads the git source. I want it to use my local source.  The rockspec file has all sorts of compile time command line gibberish that I don't want to invoke manually. Something like <code>$ luarocks install nn.rockspec --source='~/nn'</code> would be great.</p>