(TK-56) Call service-symbol in lifecycle errors

Call the service-symbol function in lifecycle error messages
to make it easier to figure out which service is causing
the error.
(TK-56) Address PR comments

Add support for services without a service symbol to lifecycle
error messages.
Merge pull request #165 from fpringvaldsen/TK-56-lifecycle-errors

(TK-56) Call service-symbol in lifecycle errors
add detail about API-breaking change in CHANGELOG
add clojars latest version to README