Add Travis configuration

We already have a buildbot running on-premise, which builds packages for
a multitude of systems; but since it is behind a firewall, it does not
(and cannot) integrate with github.

Add travis instead, which can't test as much as the buildbot, but will
give us at least a useful basic "it compiles!" test.
Add start of C++ eid-viewer
Updates
Add gettext to the picture
Add support for threading, and an initial C_WaitForSlotEvent code
Make part of the license text translatable
Fix text so it is in line with current implementation
Cosmetic change: make sure the label is aligned properly
Implement translation logic
Don't forget to add the gettextize output