Added quotes around echo's arg

thanks @dragos
Set up publication of PR final artifacts to artifactory-online.

This setup is dependent on a $typesafeArtifactoryPasswe environment
variable being passed at build ot builders, using the Jenkins Mask
Passwords plugin:

https://wiki.jenkins-ci.org/display/JENKINS/Mask+Passwords+Plugin
Merge pull request #1 from huitseeker/artifactory-publication

Publish snapshots of PR validation artifacts to typesafe's artifactory.
Revert "Set up publication of PR final artifacts to artifactory-online."

This reverts commit 1f2d8e95e9b4d97a851985f4a9a5235379c7373c.

IT caused

java.lang.NumberFormatException: There was a problem parsing 2.11.075ecb44. Versions should be in the form major[.minor[.revision]] where each part is a positive number, as in 2.10.1. The minor and revision parts are optional.
	at scala.tools.nsc.settings.ScalaVersion$$anonfun$apply$1.apply(ScalaVersion.scala:113)
Set up publication of PR final artifacts to artifactory-online.

This setup is dependent on a $typesafeArtifactoryPasswe environment
variable being passed at build ot builders, using the Jenkins Mask
Passwords plugin:

https://wiki.jenkins-ci.org/display/JENKINS/Mask+Passwords+Plugin