[Dependencies] Update Athena-Core to version 1.3.1
Fix the compilation with clang
Update the LICENSE file
Add a build configuration file for travis-ci.org
Update dependencies and fix the compilation on Linux

- XMake 2.3
- v8
- Athena-Math 1.1.7
- Athena-Core 1.3.3
[travis-ci] Disable compilation of tagged versions
Update the version number to 1.1.4
Version 1.1.4

Fix some compilation problems on Linux