causal-web-1.3.5

Changes in this release:

1. Updated Spring Boot dependency to version 1.4.6.RELEASE.
2. Updated web frameworks.
3. Added FGES and GFCI that handle mixed data using conditional Gaussian score.
4. Refactored previous FGES discrete and continuous.
5. Refactored previous GFCI disrete and continuous.
6. Switched URL of major third-party web frameworks from local to CDN.