self-hosted clojurescript support

[leonoel]

Currently missionary doesn't work on self-hosted clojurescript due to its dependency on core.async for ioc machinery. Considered strategies :

• convince core maintainers to make core.async self-hosted-clojurescript compatible, unlikely to happen
• rely on andare instead of core.async
• duplicate ioc-macros code, make it self-hosted-clojurescript compatible and ditch core.async dependency