Original searchKeywordList method no longer works with sapi-documentation branch changes

In order to allow for XML support, there were changes made to methods in KeywordService.java, KeywordServiceProxy.java, and KeywordRestService.

Problem:
Originally, SAPI would call KeywordServiceProxy#searchKeywordLists, which would get a response from KeywordRestService#searchKeywordLists. The original method in KeywordRestService would return a QueryResponse<KeywordList>.

KeywordServiceProxy#searchKeywordLists retrieves this response and attempts to deserialize the JSON into a QueryResponse<KeywordList>. However, this deserialization caused type erasure, turning all of the lists within QueryResponse to LinkedHashMaps. Because of this, XML responses could not be generated.

Changes:
To fix this problem and support XML responses, the following changes were made:

• KeywordRestService#searchKeywordLists now returns a List<KeywordList>, not QueryResponse<KeywordList>
• A new method was created in KeywordServiceProxy, called searchKeywordListsAsList
• The original KeywordServiceProxy#searchKeywordLists was set to deprecated
• KeywordService in SAPI now calls searchKeywordListsAsList

In the feature/sapi-documentation branch, the original KeywordServiceProxy#searchKeywordLists is dead code. Should it be kept in, or should it be removed?