hdlib v0.1.4

hdlib v0.1.4

Add:

• Add parser module with utility functions for dealing with input datasets;
• Check if the input pickle file exists before initializing Vector and Space objects with from_file;
• Report Vector and Spaceobjects information when calling print;
• Add examples/chopin2.py: reimplementation of the chopin2 ML model with hdlib.

Fix:

• Tags are maintained as sets when applying arithmetic operators.