GitLab

right now it's dumping the *decoder* when it should be dumping the *encoder*. this fixes that.

OpenAIGPTLMHeadModel now accepts `labels` instead of `lm_labels`

Remove '\n' before adding token into vocab

splitlines() does not work as what we expect here for bert-base-chinese because there is a '\u2028' (unicode line seperator) token in vocab file. Value of '\u2028'.splitlines() is ['', ''].
Perhaps we should use readlines() instead.