Mrp 2020 (#106)

* check for cycles

* add support for 2020 mrp format

* merge changes

* fix

* CR fixes

* remove print

Co-authored-by: Ofir Arviv <t-ofarvi@microsoft.com>

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Update Bert support (#78)

* print weights only if verbose level is 4 and above

* filtering passage longer that 510 tokens (as defined by the bert tokenizer) if using bert

* typo fix

* Update readme with bert info

* typo fix

* Moving bert filtering to Parser.parse() in order to be compatible with the LazyLoading mechanism

* Clarify error messages

* Changing bert filter to a generator function

* code conventions fix

* Remove extra empty line in readme

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* cr fixes- wrong model url and name

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