dave/tim add #config/edn
tim/dave #config/edn as composable reader
Tweak description of #config/edn
dave/tim alex pointed out that object and nil satisfy the protocols, so checking
them is pointless
Merge branch 'ednvar' of github.com:outpace/config into ednvar

Conflicts:
	README.md
dave/tim renaming ednvar params as suggested
Merge pull request #19 from outpace/ednvar

dave/tim add #config/edn