Merge pull request #2 from onaio/master

latest from root
Update LICENSE

added KoBo to license
Merge pull request #3 from onaio/master

Cleanup
test for adding notes to a data point
add more notes to test for adding notes to a data point
uk: add a notes model
uk: add, get and remove notes class methods
uk: api end point to add notes to a data point
uk: a _notes tag for mongo data
uk: notes form, allow notes to be added to a submission from the one by one browse view
uk: add NOTES and TAGS field to exports, pep8 cleanup
uk: export notes and tags to csv, xls exports
uk: move NoteForm to own file
uk: use full namespace import
uk: check formid by id_string if check by pk fails
uk: move NoteForm to api/forms
uk: use api to add note
uk: update notes endpoint test
uk: add Note model to api permissions for user
uk: add NoteSerializer