.travis.yml: Remove ppa:ubuntu-sdk-team/ppa line.
.travis.yml: Tweak Qt5 support
 .travis.yml: Add qt4-linguist-tools and qt4-qmake.
.travis.yml: Reduce Qt dependencies to libqt4-dev qtbase5-dev.
.travis.yml: Duplicate configurations to test with Qt4 and Qt5 separately.
.travis.yml: Avoid Qt4 testing altogether. Add one case with --with-working-c-locale.
.travis.yml: One last attempt to keep both Qt4 and Qt5.
Revert ".travis.yml: One last attempt to keep both Qt4 and Qt5."

This reverts commit 6c2fb50c554563977785a6af28b05c7f29a05070.
.travis.yml: Yet another attempt at both Qt4 and Qt5 testing.
Merge pull request #7 from wilx/travis-ci-build-fixes

Travis ci build fixes