Revert "Update travis file"

This reverts commit cb61fa6fb3f9f64bac4f2a3b71c6471ffdb226eb.
Revert "Revert "Update travis file""

This reverts commit 9f5c7d283caf976193fb4a4ea3edc8b6bf9e4ec1.
Revert "Update travis file"

This reverts commit cb61fa6fb3f9f64bac4f2a3b71c6471ffdb226eb.
add deploy host key