Fix for cross-compile(from java 8 to java 7) in RequestContext(ConcurrentHashMap) #401
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This PR propose a solution to the problem in cross compilation.
When the zuul is compiled in jdk 8 and run in jdk 7 the exception it is launched:
"Caused by: java.lang.NoSuchMethodError: com.netflix.zuul.context.RequestContext.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;"
The problem it is more detailed in: https://gist.github.com/AlainODea/1375759b8720a3f9f094