'esketch-php' is now working.

The PHP variant of eSketch, esketch-php, is now working on GNU/Linux, macOS and Windows. It is deployed on AppVeyor and Travis CI continuous integration services.

The eSketch software is used as skeleton for various types of programs. esketch-php is the PHP variant of this software, and, as it is now working, this opens the way for other PHP programs based on the Epeios framework.

Usually, Travis CI is used for both GNU/Linux and macOS, but, as for October 2017, Travis CI doesn't handle PHP on macOS, so only the GNU/Linux version of esketch-php, and this will also the case for upcoming PHP programs, is deployed on Travis CI.