Draft DAIBuilder
Finish DAIBuilder, implement HDCSLU alignment, amend test scripts
Fix non-abstracted utterance alignment, add docstrings 

Properly handle non-abstracted utterance in parse_meta by storing and using a mapping from utterance indices to abutterance indices.
Merge pull request #110 from jakub-stejskal/aligned_hdcslu

Utterance-DA alignment in HDCSLU