Travis implementation allowing to build four targets on change of master or a matching pattern of feature/*.

This implementation differs from existing fltk-test and also gitlab implementation :
 - minimum, fast light implementation: stripoped all unused constructions compared to other implementations
 - supports successful builds of four targets (linu, osx and then gcc and clang for each of them)
- uses before_script instead of before_install
- uses after_success for building documentation, instead of building always if error
- only builds documentation on linux targets for now (can easily change if future)

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