GitLab

* PAI Training service implementation
**1. Implement PAITrainingService
**2. Add trial-keeper python module, and modify setup.py to install the module
**3. Add PAItrainingService rest server to collect metrics from PAI container.

* support install from venv and travis CI

* support install from venv and travis CI

* support install from venv and travis CI

* support conda

* support conda

* modify example config path to relative path and increase maxTrialNum

* undo messy commit

* undo messy commit

* Merge latest code changes into Github Master

* temporary modification for travis

* temporary modification for travis