Fix for #16, #17. New features #19, #21, #22, #23, #26, #27, #28, #29, #30..

- Fixed #17, renamed to-json to from-json
- Fixed #16, readme lacked document_type param. Adjusted import cmd to match rename of #17
- Fix for #19: MLQueryBuilder factory, for building structured queries
- Fix for #21: added extspell rest-extension
- Fix for #22: added extsimilar rest-extension
- Fix for #23: added analyze-data rest-extension
- Fix for #26: rest-transform for downloading binaries with more accurate mime-type
- Helper library for highlighting, and sending email (used by below rest transforms)
- Fix for #27: rest transform for converting XML to JSON
- Fix for #28: rest transform for converting JSON (back) to XML
- Fix for #29: rest transform for getting 'prettified' XML
- Fix for #30: rest transform for filtering binaries at upload