minor #410 Fixed tests on Windows systems (javiereguiluz)
minor #410 Fixed tests on Windows systems (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #410).

Discussion
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Fixed tests on Windows systems

Trying to fix the AppVeyor issues by reusing Symfony's `appveyor.yml` file.

Commits
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274a5eb Fixed tests on Windows systems

yceruto/symfony-demo,voronkovich/symfony-demo,bocharsky-bw/symfony-demo,javiereguiluz/symfony-demo,yodur2potassium/test-behat-selenium-symfo,TomasVotruba/symfony-demo,yceruto/symfony-demo,samitiana/symfony-demo,yodur2potassium/test-behat-selenium-symfo,Codeception/symfony-demo,yceruto/symfony-demo,yodur2potassium/test-behat-selenium-symfo,samitiana/symfony-demo,dzuelke/symfony-demo,maidmaid/symfony-demo,symfony/symfony-demo,Codeception/symfony-demo,voronkovich/symfony-demo,maidmaid/symfony-demo,javiereguiluz/symfony-demo,symfony/symfony-demo,javiereguiluz/symfony-demo,maidmaid/symfony-demo,nilamkhedkar1/symfony_demo,symfony/symfony-demo,nilamkhedkar1/symfony_demo,voronkovich/symfony-demo,TomasVotruba/symfony-demo,dzuelke/symfony-demo,samitiana/symfony-demo,TomasVotruba/symfony-demo,bocharsky-bw/symfony-demo,Codeception/symfony-demo,nilamkhedkar1/symfony_demo,bocharsky-bw/symfony-demo,dzuelke/symfony-demo