Fixes IE which can't use String.endsWith (#1825)
Fixes IE which can't use String.endsWith (#1825)


openzipkin/zipkin,openzipkin/zipkin,adriancole/zipkin,adriancole/zipkin,openzipkin/zipkin,openzipkin/zipkin,twitter/zipkin,twitter/zipkin,openzipkin/zipkin,twitter/zipkin,adriancole/zipkin,adriancole/zipkin,twitter/zipkin