added script fields functionality to SearchDsl. Implemented test case for changes in SearchDslTest. Mmodified search.md to include explanation of new functionality. Added search_script_fieldsZ_poc.json file to test resources for use in unit test case
Merge pull request #228 from hfgiii/master

added script fields functionality to SearchDsl
Tweaked script DSL. Added tests for scripts.
Update search.md
Updated some syntax to use case objects
Lovingly reformatted by scalariform
Added some new operations to count dsl
Added missing operations on optimize
Added missing operations to get dsl