Revert commit a068850
Revert commit a068850

According to travis-ci/travis-ci#2111 and some own testing, it isn't possible to combine branch whitelists with tag-based auto deployment. Unfortunately it is necessary to whitelist the gh-pages branch, because Travis implicitly blacklists it.

smcdougall/Pico,ondrejd/Pico,fabianacero/fabianacerog,fabianacero/fabianacerog,TakamiChie/Pico,lukasz-jakub-adamczuk/tech-jump-guide,ondrejd/Pico,picocms/Pico,TakamiChie/Pico,TakamiChie/Pico,PhrozenByte/Pico,theshka/Pico,dav-m85/Pico,fabianacero/fabianacerog,smcdougall/Pico,picocms/Pico,dav-m85/Pico,picocms/Pico,TakamiChie/Pico,theshka/Pico,PhrozenByte/Pico,smcdougall/Pico,lukasz-jakub-adamczuk/tech-jump-guide,theshka/Pico,dav-m85/Pico,lukasz-jakub-adamczuk/tech-jump-guide,PhrozenByte/Pico,ondrejd/Pico