fixed #69
fix #68 - IO errors on OCSP responders are cached in memory. Also OCSP
cache memory usage is better controlled.
fix #68 - IO errors on OCSP responders are cached in memory. Also OCSP
cache memory usage is better controlled.
Cleaned up caching. The responder errors cache refactored to use proper
keys.
Conflicts:
	src/main/java/eu/emi/security/authn/x509/helpers/ocsp/OCSPCachingClient.java
	src/main/java/eu/emi/security/authn/x509/helpers/ocsp/OCSPVerifier.java
	src/main/java/eu/emi/security/authn/x509/helpers/proxy/ProxyGeneratorHelper.java