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cc @lysandrejik

* fill_mask helper

* [poc] FillMaskPipeline

* Revert "[poc] FillMaskPipeline"

This reverts commit 67eeea55b0f97b46c2b828de0f4ee97d87338335.

* Revert "fill_mask helper"

This reverts commit cacc17b884e14bb6b07989110ffe884ad9e36eaa.

* README: clarify that Pipelines can also do text-classification

cf. question at the AI&ML meetup last week, @mfuntowicz

* Fix test: test feature-extraction pipeline

* Test tweaks

* Slight refactor of existing pipeline (in preparation of new FillMaskPipeline)

* Extraneous doc

* More robust way of doing this

@mfuntowicz as we don't rely on the model name anymore (see AutoConfig)

* Also add RobertaConfig as a quickfix for wrong token_type_ids

* cs

* [BIG] FillMaskPipeline

Requesting pad_token_id would cause an error message when it is None. Use private _pad_token instead.

In batch_encode_plus we have to ensure that the tokenizer has a pad_token_id so that, when padding, no None values are added as padding. That would happen with gpt2, openai, transfoxl.

closes https://github.com/huggingface/transformers/issues/2640

- mostly stylistic streamlining
- removed 'additional context' sections. They seem to be rarely used and might cause confusion. If more details are needed, users can add them to the 'details' section

Motivate users to @-tag authors of models to increase visibility and expand the community

- change references to pytorch-transformers to transformers
- link to code formatting guidelines

- add 'your contribution' section
- add code formatting link to 'additional context'

Prefer that general questions are asked on Stack Overflow

Streamlines usages of pytorch-transformers and pytorch-pretrained-bert. Add link to the README for the migration guide.

cc @julien-c @thomwolf