The plugin with its version is specified in the root pom. However when I ran a build I get

`[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.squareup.picasso:picasso:jar:2.0.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' for org.codehaus.mojo:emma-maven-plugin is missing. @ line 72, column 15
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
[INFO] ------------------------------------------------------------------------
`