Updating travis to run all the tests given the new sub-packages

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 4c85a20..b66cd48 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,7 @@
 # in the vendor directory. We don't need to test all dependent packages.
 # Only testing this project.
 script:
-  - GO15VENDOREXPERIMENT=1 go test -v .
-  - GO15VENDOREXPERIMENT=1 go test -v ./cmd
+  - GO15VENDOREXPERIMENT=1 go test -v . ./cmd ./gb ./util ./yaml
 
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