As Supler has two parts, they are deployed in different repositories. The backend can be found in Sonatype’s OSS repository, and if you have e.g. an SBT build you just need to add:
libraryDependencies += "com.softwaremill.supler" %% "supler" % "0.3.0"
If you like living on the edge, you can use development version of supler.
Add the SNAPSHOT repository (this is SBT, but the repository is maven - you can use it in your favorite build system):
resolvers += "OSS JFrog Artifactory" at "http://oss.jfrog.org/artifactory/oss-snapshot-local"
and then add the dependencies for both supler backend:
libraryDependencies += "com.softwaremill.supler" %% "supler" % "0.4.0-SNAPSHOT"
and frontend (in bower.json):