Upgrade to Spring Vault 1.1.0.
Upgrade to Spring Vault 1.1.0.

Closes gh-106.

spring-cloud-incubator/spring-cloud-vault-config,spring-cloud-incubator/spring-cloud-vault-config,spencergibb/spring-cloud-vault-config,mp911de/spring-cloud-vault-config,spencergibb/spring-cloud-vault-config,mp911de/spring-cloud-vault-config