Extend Duckling to be able to parse custom entities

[MennaCC]

Story

As a module developer I can define custom entities for a certain module, so that it would be parsed from a sentence when classified as this module.

Assumptions

• Entities are passed as a dict of (key: entity_name , value: list of values)
• We have access to module_info[name]

Technical Details

• This is done through extending duckling, by adding to corpus files
• This issue is adding a python wrapper for duckling dependency
  (editing the requirements.txt will be needed)

Acceptance Criteria

• create corpus file by the name of module
• the name of dim created inside the corpus file is in format 'nameOfModule_nameOfEntity'
• created corpus file is added to the duckling jar though a function added to the library wrapper ( in wrapper.py)
• any further re-installations of packages, or loading of corpora is handled