delay format data until somebody uses the row by using
this.model.byId('rowId');
fix a bug
opertimaze cell render performance
should not ignore rawData, thanks to jsonn@github.com
cache format result
implement tree filter for async cache
Merge pull request #270 from shanghaikid/performanceOptimization

Performance optimization
virtualVscroller fix
implement restore pre condition for ZOS
fix filter issue
add default param
Merge branch 'master' into 1.3