Make .travis.yml build only develop branch
Make .travis.yml build only develop branch

Migrated from Sable/mclab@91723fe7f896f1769b39939dd84a4f0ddb3f68e1

Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core