Edited Issue: Consider improve the extensibility of DefaultODataPathHandler [676]

The scenario is to support azure url convention: /EntitySet/Key instead of /EntitySet(Key)<br /><br />Currently, if user want to override the default behavior, he needs to override the ParseKeyValuePathSegment method and using try catch to its base method to swallow ODataException. <br /><br />We should avoid user to use try catch. There must be some way that we can improve it.