[bob.io.base.load] Raise a proper error if the file does not exist

See merge request !33

[vstack_features] Improve load speeds using numpy field arrays

See merge request !32

[conda recipe] Add make next to cmake dependency

See merge request !31

Removed traces of bob.io.matlab

See merge request !30

create_directories_safe: use the new exist_ok flag in os.makedirs.

See merge request !29

Add a function to load features in a memory efficient way

See merge request !27

Resolve "HDF5_VERSION is computed but never used"

Closes #19

See merge request !25