remove the set -o pipefail, its no longer doing anything
remove the set -o pipefail, its no longer doing anything

this was added here:

https://github.com/circleci/frontend-private/pull/350/files

Specifically to fail if `tee` failed. However, we are removing `tee`
 from the pipeline since we now have lein cljsbuild failing properly
 when the compilation throws a warning.

circleci/frontend,circleci/frontend,circleci/frontend