add tests for sync framework
add tests for sync
add task for coverage generation
add more tests
improve sync client test coverage to 95%
sync client: save meta data to persist storage
remove unused file
merge feedhenry3 branch
adding changelog
merge feedhenry3 branch
updates after code review
merge feedhenry3 branch
merge from feedhenry3 branch
Merge pull request #51 from feedhenry/6635-test-sync-framework

6635 test sync framework