Append auth token only when available in travis environment (#13272)
Append auth token only when available in travis environment (#13272)

* Append auth token only when available in travis environment

* Remove unused var

sprintr/brackets,zaggino/brackets-electron,MarcelGerber/brackets,MarcelGerber/brackets,sprintr/brackets,pratts/brackets,zaggino/brackets-electron,pratts/brackets,adobe/brackets,ficristo/brackets,zaggino/brackets-electron,adobe/brackets,ficristo/brackets,zaggino/brackets-electron,MarcelGerber/brackets,zaggino/brackets-electron,ficristo/brackets,MarcelGerber/brackets,Wikunia/brackets,pratts/brackets,MarcelGerber/brackets,sprintr/brackets,adobe/brackets,ficristo/brackets,pratts/brackets,Wikunia/brackets,Wikunia/brackets,adobe/brackets,Wikunia/brackets,ficristo/brackets,adobe/brackets,zaggino/brackets-electron,sprintr/brackets,pratts/brackets,Wikunia/brackets,sprintr/brackets