handle EOS, UNK after softmax in generation

Merge pull request #202 from may-/torch13

JoeyNMT v2.2.0

Merge pull request #194 from may-/torch12

joeynmt v2.1.0

Merge pull request #174 from may-/tokenizer

JoeyNMT version2.0.0

Version 1.5

Version 1.4

Updated torch version and added n-best example call.

Update README.md

Merge pull request #59 from joeynmt/joey-transformer

Updating documentation, benchmarks, README.