v1.3.7

Lots of documentation, bugs squashed and misc changes.

Features

• Load checkpoint for fine-tuning in 0349c3f by @henrykmichalewski !
• Added generic input pipeline for GLUE tasks in 2f490e8 by @henrykmichalewski - thanks a lot!
• Some nascent support for bfloat16s!

Models

• Performer's Favor and CausalFavor - 77db199 thanks @lukaszkaiser !
• Funnel-Transformer in #1156 thanks a lot @mvxxx !
• BERT for Trax in #1254 , #1223, etc by @piotrekp1 - thanks a lot!
• Residual Exchange Network by @kkanska in 3a8f402 ! Thanks!

PRs Merged

• Fixing broken example links in #1263 thanks @amtagrwl !
• Added WideResnet, Deconv etc Example Notebook in #1259 , #1202, #1232 thanks a lot! @SauravMaheshkar !
• Remove implicit object from the base class in #1228 thanks @HarshCasper !
• Fashion MNIST example in #1199 thanks @jimexist !
• Fix PretrainedBERT init in #1135 by @hepaajan !
• Typo in the TransformerDecoder input parameters description in #1100 by @kujaomega !