Easysparql

Add support to python3

Add the following functions:
* `get_properties_of_subject`: Get the properties of a given subject.
* `get_numerics_from_list`: Get the numbers from a list of strings and numbers (if they are more that the provided percentage).
* `get_num`: Get the number of a given number/string or None (if it was not a number).

and remove some unused functions.

* Add tests
* Add the following functions:
* `get_subjects`: Get the number of subjects of a given class.
* `get_properties_of_subject`: Get the properties of a given subject.
* `get_property_count`: Get the number of objects of a given subject/property pairs.

This is a pip release of easysparql with dependencies.

It is composed of the following functions:
* `run_query`: run a sparql query
* `get_entities`: get candidate entities of the given name (exact match)
* `get_classes`: get classes of a given entity
* `get_parents_of_class`: get direct parent classes of a given class