bug_fix:missing utils (alibaba#183)

* add init.py

bump version to 0.6.0 and update release doc

add v0.5.0 change_log (alibaba#139)

update version

update version (alibaba#117)

fix eval metric during training and add metric unittest

update version

Merge pull request #6 from Cathy0908/master

[Feature]: uniform input and output format for transforms