Cairo fix and more informative errors

Make cairosvg import optional, better error handling for signature generation.

Python 3.5 signature fix

Fixed a bug where some images would not compute signature correctly

Elasticsearch 5 compatibility

• Elasticsearch 5 query compatibility
• can now specify wait for write acknowledgement on add_image.
• can check for duplicate record paths before adding

Fix duplicate return values

Fixed a bug related to python3 conversion

Fix all orientations search

All orientations was throwing an exception since the python3 compatibility change. Now fixed.

Python 3 compatibility

Now Python3-compatible! Thanks @saru95 for your contribution.

Add metadata fields

Now you can save metadata with the image records.

improve setup

• rework setup.py and add package to PyPi
• add dockerfile and add to dockerhub

pavlovml interface

• Implement pavlovml (non-breaking) interface changes
• Fix bug with latest elasticsearch driver

image-match release

• Initial release