Travis-CI: testing Qt 5.4 on Linux.
Travis-CI: testing Qt 5.4 on Linux.

The PPA for Qt 5.4 seems to be available, so time to try it.

Fairly/opencor,mirams/opencor,Fairly/opencor,mirams/opencor,Fairly/opencor,Fairly/opencor,mirams/opencor,Fairly/opencor,mirams/opencor,mirams/opencor