cell navigation start
Bug fixes/refactoring cell selection/navigation.
Cell focus can show input element. Cell navigation works if canSelectRows is false.

Works in IE8 too. Added an editable cell template to show how to use
batch editing when focused on cell.
Can now have display and editable cell templates.
Fixed bug when navigation using cells versuss rows.
Merge branch 'master' into cell-navigation

Conflicts:
	workbench/main.js
Changing the way rows are built

Removing __ng_selected__ property from the entities. in place there will
be a property appended to all data items in the data array called
"ngGridRow" there, you can manipulate selections programatically easier
than the current method.
fixing bug with searching.
checking in filter-row example
Updating to 1.7.0

Add new way for selecting rows programmatically. Row index is now zero
based. Added/changed grid emit events.
Merge pull request #129 from angular-ui/cell-navigation

Cell navigation