fixes #1448 - the continuous browsing was reloading with the data also, now it's fixed
                    - also there was a bug in the interation of the data for the continuous browsing
fixes #1337 - changed the whole indicator loading to be asynchronous so DOM can be updated earlier
                    - inserting loading placeholder before the graph is generated
fixes #1375 - added a loading icon in the left side of the graph that is shown when data is being reloaded in the graph
Merge pull request #1491 from OCHA-DAP/arti-sprint-35

loading icon improvement + bug fix