CheckBox can be disabled through a top-level data field
Changed disabled checkbox from using props to states; it now works with filter and sort.
'hideDisabledCheckboxField' option for ngReactGridCheckbox
'disableCheckboxField' option for ngReactGridCheckbox can reference arbitrarily nested object field
Merge remote-tracking branch 'parent/master' into disabled-checkbox

Conflicts:
	build/js/ngReactGrid.js
	build/js/ngReactGrid.min.js
	src/js/factories/ngReactGridCheckboxFactory.js
	src/jsx/reactGridCheckbox.jsx
Batch checkbox toggle no longer toggles disabled row checkboxes. Minor inline comments.
Merge pull request #21 from ewu02/disabled-checkbox

Disable checkBox through a top-level data field