Initial elasticsearch writer support
Merge pull request #1 from msievers/elasticsearch_writer

Initial elasticsearch writer support
Add pry for debugging stuff.
Fix a bug with stack signatures.
Version bump
Added shell script to extract single files from aleph/mapmapper archives
Moved pry(-nav) dependency to gemspec as development dependency
Added minitest development dependency to gemspec
Removed tidy from utils/mab_by_docid, because it does more than just indenting (removes important spaces)
Added minitest based test environment