Remove old training system entities
Remove directories before generate codes
Remove out-date code
Merge pull request #231 from mzry1992/training-system

Remove old training system
Update Font-Awesome and MathJax
Merge pull request #232 from mzry1992/training-system

Update Font-Awesome and MathJax
Fix navbar style
Update database for training system
Update Training System entities
Merge pull request #233 from mzry1992/training-system

Update training system databases
Add training database tools
Add training service ITTest
Merge pull request #234 from mzry1992/training-system

Training database tools
Add training list and editor
Merge pull request #235 from mzry1992/training-system

Add training list and editor