feat: add multi select to the users grid
feat: very simple mass update example
chore: create grid controller, expose it to the parent scope
feat(gridz): add method for reloading the grid
chore: user reloadGrid method inside the mass update dialog
feature(gridz): create `getSelectedRowIds` method for retrieving selected row ids
chore: minor refactoring
feat(grids) add nice icon for mass update actions
Merge pull request #70 from 9ci/feature-mass-update

I can mass update users paid flag