Polish configuration
Temporarily ignore CachedRestClientTests

Avoid intermittent failures on CI until we've tracked down the root
cause.

See #342
Upgrade to Spring Boot 1.0.0 GA

 - Remove use of @EnableTransactionManagement, as this is Now implicitly
   enabled in Spring Boot 1.0.0 GA. See spring-projects/spring-boot#576

 - Note that this change also implicitly upgrades to Spring Framework
   4.0.3 GA as well

 - Replace use of /libs-milestone repository for /libs-release as we now
   no longer depend on any non-GA artifacts