Added __weak attribute to the CPTPlot dataSource property.
Added __weak attribute to the CPTPlot dataSource property.

sureshdustrise/core-plot,divyavamsee/core-plot,sureshdustrise/core-plot,eoinnorris/core-plot,kamalvenkat/core-plot,zenXian/core-plot,divyavamsee/core-plot,eoinnorris/core-plot,tectronics/core-plot,eoinnorris/core-plot,LiDechao/core-plot,zenXian/core-plot,kamalvenkat/core-plot,kamalvenkat/core-plot,LiDechao/core-plot,tectronics/core-plot,eoinnorris/core-plot,zenXian/core-plot,sureshdustrise/core-plot,zenXian/core-plot,sureshdustrise/core-plot,kamalvenkat/core-plot,divyavamsee/core-plot,tectronics/core-plot,divyavamsee/core-plot,LiDechao/core-plot,LiDechao/core-plot,tectronics/core-plot