fix(uiSelectMultiple): $select.refreshItems is not a function 
fix(uiSelectMultiple): $select.refreshItems is not a function 

Resolves exception:

TypeError: $select.refreshItems is not a function at 
uis.directive.$timeout.controller.ctrl.refreshComponent 

when the select is multiple (v 18.0 & master)
piebe/ui-select,Crunch-io/ui-select,oncompass/ui-select,ivanvoznyakovsky/ui-select,oncompass/ui-select,piebe/ui-select,looker/ui-select,angular-ui/ui-select,WorktileTech/ui-select,Crunch-io/ui-select,WorktileTech/ui-select,piebe/ui-select,prakashn27/ui-select,prakashn27/ui-select,Servoy/ui-select,Servoy/ui-select,ivanvoznyakovsky/ui-select,WorktileTech/ui-select,angular-ui/ui-select,Jobularity/ui-select,granteagon/ui-select-temp,looker/ui-select,Servoy/ui-select,billypon/ui-select,MartinDeHaan/ui-select-submitform,Jefiozie/ui-select,oncompass/ui-select,Jobularity/ui-select,Jefiozie/ui-select,granteagon/ui-select-temp,ivanvoznyakovsky/ui-select,looker/ui-select,MartinDeHaan/ui-select-submitform,angular-ui/ui-select,granteagon/ui-select-temp,Jobularity/ui-select,MartinDeHaan/ui-select-submitform,Crunch-io/ui-select,billypon/ui-select,billypon/ui-select,prakashn27/ui-select,Jefiozie/ui-select