[#1447] Yekkanti - Refactored and optimized the sync process for single child
[#1447] Yekkanti - Changed the image/audio sync logic so that multiple downloads will not happen
#1447 Suganthi|Yekkanti Fixed the change log defect partially
[#1447] Yekkanti - Refactored good amount of code around change logs handling
[#1447] Yekkanti|Kavitha Changed the logic to sync media to reduce number of requests to server
[#1477] Yekkanti | Kavitha Added more tests on to changelogs and media sync
Merge branch 'master' of github.com:rapidftr/RapidFTR---Android
[#1477] Yekkanti - Remvoed unused test and fixed a compilation issue becuase of merge