update modify extension

if there is no lazyData, return cache directly due to performance issue
update code format
Merge branch 'master' of https://github.com/oria/gridx
Update hiddenColumns after setColumns
Fix indirectSelectColumn select all regression
fix memory leak issue in filterDialog
Merge branch 'master' of https://github.com/oria/gridx
fix issue in single sort

First sort ColumnA , then setColumns to exclude A, then sort Column B ,
error occurs because t._sortId remains while domeNode is not there
fix issue #95

the onCellWidgetCreated function defined on column will be fired twice
Fix column width on ios and android
Merge branch 'master' into 1.2