RR: add user share settings view
RR: test for all users
RR: share dataset with user functionality, closes #123
Merge branch 'master' into share-dataset-123

Conflicts:
	src/clj/ona/api/dataset.clj
Merge branch 'master' into share-dataset-123
RR: explicitly get username and role from params
RR: integrates share-users-settings page to sharing
RR: include open-account option
Merge branch 'share-dataset-123' of github.com:onaio/ona-viewer into share-dataset-123

Conflicts:
	src/clj/ona/viewer/routes.clj
	src/clj/ona/viewer/templates/datasets.clj
	src/clj/ona/viewer/templates/forms.clj
	src/clj/ona/viewer/views/datasets.clj
	src/clj/templates/dataset/list.html
RR: tests for settings routes