GitLab

- Make it consistent with '/bin/bash' shebang
- Fix "Bad substitution" error in BASH_SOURCE[0]

To fix the following error:
File "/usr/local/lib/python3.6/dist-packages/absl/flags/_flagvalues.py", line 698, in get_value raise _exceptions.Error('Missing value for flag ' + arg) # pylint: disable=undefined-loop-variable absl.flags._exceptions.Error: Missing value for flag -v

* deeplab quantize

* Fix bug in train.py

* Create quantize.md