Update region names with tildes. Close #41
Merge branch 'enhancement-#41' into develop
Check indicators starred state with the API

Check Indicator.starred and CompoundIndicator.starred against the API.
The indicator will preserve its starred state in the DB. The default state
for new indicators will be False.
Add Indicator.starred tests. Close #40
Merge branch 'enhancement-#40' into develop
Enrich the indicators with last_update field.

Update the Indicator and CompoundIndicator last_update field from
the helpers layer.
Add Indicator and CompoundIndicator last_update tests
Merge branch 'enhancement-#31' into develop
Use unicode objects for continent names.

Continent names contain tildes, so they must be wrapped into an
unicode object before sending them to the database.
Temporary fix travis.yml

The last commits to the model are not merged into the main branch
so I had to modify the .travis.yml file to checkout to the
branch which contains the lastest changes.