v0.2.1

Code quality update

• Add --debug option to compile with debug information
• Add -o,--out option to specify executable name
• Change base grammar to be more functional : remove return and functionCall + transform () to be an operator
• Specify type is mandatory, so no more type inference
• Add a script to easily change the version
• Rewrite all tests
• Refactor entire code to make a lib used by the executable
• Use googletest for tests