Order of results in REST calls

[dukefoss]

Description:
The results from method "getSimilarInstancesByID" are in ascending order but should be in descending order. Only an error when k=-1. (If k>0 the results are correctly descending).

Steps to reproduce:

1. Add Concept and Case Base with REST API. (/Or import project and skip step 1,2 and 3)
2. Add attributes.
3. Add instances.
4. Call method "getSimilarInstancesByID" with k = -1 (Default value)

Expected and Actual Result:
Expect result cases to be descending, but is ascending.

Note:
Query.java (package no.ntnu.mycbr.rest) line 273:
if(k>0){ ... }
Does not set "RETRIEVE_K_SORTED" if k=-1.