travis: test with Qt 5.9.1

[ci skip] fix format in Readme, add contributors

Version 1.4.0

[ci skip] Update supported Qt versions

Update travis.yml: download test file

Fix CheckFile(): check suffix of the file

Windows build: fix cp command

Fix Qt 5.7 build

Fix build on Windows: chande INCLUDEPATH

Exlude installation of gcc-4.7 in .travis.yml