.travis.yml: Cleanup: Reorder packages
.travis.yml: Cleanup: Reorder packages

To the same order as the packages listed in
http://stb-tester.com/getting-started.html#package-names

martynjarvis/stb-tester,martynjarvis/stb-tester,stb-tester/stb-tester,LewisHaley/stb-tester,martynjarvis/stb-tester,martynjarvis/stb-tester,stb-tester/stb-tester,wmanley/stb-tester,LewisHaley/stb-tester,stb-tester/stb-tester,LewisHaley/stb-tester,stb-tester/stb-tester,wmanley/stb-tester,martynjarvis/stb-tester,martynjarvis/stb-tester,LewisHaley/stb-tester,martynjarvis/stb-tester,LewisHaley/stb-tester,wmanley/stb-tester,wmanley/stb-tester,wmanley/stb-tester,LewisHaley/stb-tester,LewisHaley/stb-tester