Merge branch 'age-range-support' into 'staging'

internewshid/chn_spreadsheet/importer.py

...newshid/chn_spreadsheet/tests/test_files/sample_kobo.xlsx

internewshid/hid/assets.py

internewshid/hid/filters.py

internewshid/hid/fixtures/bangladesh-refugee-crisis.json

internewshid/hid/forms/item.py

internewshid/hid/static/hid/js/enable_multiselect.js

internewshid/hid/tables.py

internewshid/hid/tabs/view_and_edit_table.py

internewshid/hid/templates/hid/add_edit_item.html

internewshid/hid/templates/hid/age_range_column.html

internewshid/hid/templates/hid/tabs/filters/age_range.html

internewshid/hid/tests/add_edit_form_tests.py

internewshid/hid/tests/add_edit_item_view_tests.py

internewshid/hid/tests/filter_tests.py

internewshid/hid/tests/itemtable_tests.py

internewshid/hid/tests/views_tests.py

internewshid/hid/views/item.py

internewshid/media/js/bootstrap-multiselect.js

internewshid/media/less/bootstrap-multiselect.less