cumbof/hdlib: hdlib v0.1.15

hdlib v0.1.18

Add:

• The space dictionary as part of a Space object is now an OrderedDict, making Space objects iterable over their set of vectors;
• Python examples under the examples folder are now available as part of the hdlib package.

Fix:

• Fix dumping and loading Vector and Space objects to and from pickle files;
• space.Space.bulk_insert function now checks whether the names of the input vectors are instances of bool, int, float, str, and None before creating and inserting vectors into the space;
• Distance thresholds in space.Space.find and space.Space.find_all are now set to numpy.Inf by default.