Closes #6

Conflicts:
	libs/routes/api.js

- Rename /matriculas to /enrollments
- Add initial support for parameters in the enrollments route

Conflicts:
	package.json

Add cors

Added CORS (Cross-Origin Resource Sharing) to API. This way the API allows different URLs to use it.

See merge request !1

Related: #3

Signed-off-by: João Victor Tozatti Risso <jvtr12@c3sl.ufpr.br>

Implement the following aggregations:
- per-state
- per-region
- country

In order to use these queries one should use the /api/v1/matriculas route. When
the 'agregar' query parameter is set, one could use the values 'estado' and 'regiao'
to run the aggregation for state and region, respectively. Otherwise, if no parameters
are supplied, it defaults to the whole country aggregation query.

Not following any specs