fixes #1517 - changed the style of the feedback button
                    - compatibility change for BS 2.3 - icon is replaced with an img "paperPlane.png"
fixes #1587 - GA track downloads, previews, shares
                    - fixed Google Analytics for new indicator and dataset pages
                    - added new event types + and places where they are recorded
                    - more relevant information for the event value - dataset names, file names, etc
Merge pull request #1638 from OCHA-DAP/arti-sprint-37

Arti sprint 37