Port r6909: Created a new datasource from the YAHOO XHRDatasource to allow the live data url to be configurable using a callback function. Also, updated the activities page to use this new datasource. Part of #1363.
Port r6909: Created a new datasource from the YAHOO XHRDatasource to allow the live data url to be configurable using a callback function. Also, updated the activities page to use this new datasource. Part of #1363.

git-svn-id: 4b387fe5ada7764508e2ca96c335714e4c1692c6@6943 0d517254-b314-0410-acde-c619094fa49f

NUBIC/psc-mirror,NUBIC/psc-mirror,NUBIC/psc-mirror,NUBIC/psc-mirror