Server Side Sorting control
Server side sorting control tests
Fixed parse method and added some tests
Merge qvicksilver/server_side_sorting
Refactor ServerSideSortingControl

- Fix lint errors
- Always store SSSC sort fields as array
- Rename test file to match 'make test' pattern
Rename ServerSideSortingControl

ServerSideSortingRequestControl will be more consistent when
ServerSideSortingResponseControl is implemented.
Add ServerSideSortingResponseControl
Merge ServerSideSort controls

Fix mcavage/node-ldapjs#187