Java 5 support

I mainly use JsonPath with Spring-test and spring-test 3.2.* on its own support Java 5. 

This pull request simply removes @Override annotations from method implementations.

The main problem was with https://github.com/jayway/JsonPath/blob/master/json-path/src/test/java/com/jayway/jsonpath/util/ScriptEngineJsonPath.java file. I found that it was used only in one test to sysout something - and it seems that it was used only for development. I have removed that file - is it acceptable?

Another options are
1. to add required for JSR223 on Java5 dependencies (they are not in central maven repo)
2. to rewrite it with any other javascript engine.