test(rxSortableColumn): `get` for properties
Merge pull request #559 from Droogans/e2e-rx-sortable-column-updates

test(rxSortableColumn): `get` for properties
test(rxSortableColumn): data from cell contents
Merge pull request #562 from Droogans/e2e-rx-sortable-column-data

test(rxSortableColumn): data from cell contents
chore(version): v1.2.2 [skip ci]
feat(tooltips): Add tooltip directive

Closes #552
Merge pull request #554 from rackerlabs/552_tooltips

feat(tooltips): Add tooltip directive
docs(contributing): clarified some of the squash process