Travis: Enable tracing on the script to ease troubleshooting

.travis-build.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+set -x
 
 #if OS is linux or is not set
 if [ "$TRAVIS_OS_NAME" = linux -o -z "$TRAVIS_OS_NAME" ]; then 

.travis-deps.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 set -e
+set -x
 
 #if OS is linux or is not set
 if [ "$TRAVIS_OS_NAME" = linux -o -z "$TRAVIS_OS_NAME" ]; then