add genrated files to gitignore

Signed-off-by: Reto Zingg <reto.zingg@jollamobile.com>
generate tests.xml dynamically

install paths for Qt4 and Qt5 are different, tests.xml needs execution
paths accordingly.

[qa] generate tests.xml dynamically depending on Qt version

Signed-off-by: Reto Zingg <reto.zingg@jollamobile.com>
Merge pull request #6 from d0b3rm4n/fix-tests-xml

Fix tests xml depending on the Qt version