-added logic to echo search query number to server side. Query search numbers
echoed back to angular are checked to see whether they are the latest search
results. Latest results are kept, older results are discarded.
Bug #102 : added counter on backend for handling search concept ajax call
Merge branch 'master' of https://github.com/waichee/openmrs-cpm
-search now filters the latest results from get request by echoing request number to server.
-added request number counter
-code checks for latest result