Fix pad doc

See merge request !131

Several changes

See merge request !128

Fix grid

See merge request !129

* Fix casia surf multi-channel implementation
* Improve docs and the pointers to root dirs of databases
* Fix the maskattack database interface
* Use pytest instead of nose
* Add baseline results of deep-pix-bis

Fix deep-pix-bis, add more tests, update docs

See merge request !127

Fix pytorch pip package name

See merge request !126

Add DeepPixBis baseline

Closes #47

See merge request !125

* bob pad vanilla-pad was renamed to bob pad run-pipeline
* adapt to changes in bob.pipelines

Remove deprecated code

Closes #46

See merge request !124

Drop bob.db.atnt and bob.ip.base

See merge request !123