NRT rendering

[bion]

Overtone doesn't provide interop with scsynth in nrt mode. http://doc.sccode.org/Guides/Non-Realtime-Synthesis.html

• add integration spec that asserts score file identical to one generated by sclang
• add send-fn for peer in osc-clj that writes to file or score buffer
• add render-score function that generates score.osc file and feeds it to an scsynth instance in nrt mode. server output is tee'd to cider console and optional log file