Fix for "Output spec-array length invalid: 1 <> 2"
Introduced multithreading
Added progress indicator; refactoring
Cleanup, `RsClient` is no longer connected with `UriBuilder`

Removed connection `JiraOnlineAdapterRsClient` with
`JiraOnlineAdapterUriBuilder`
JUnit cleanup
Added an option to set thread count
Merge remote-tracking branch 'origin/dev' into itc_common