[SPARK-1342] Scala 2.10.4

[markhamstra]

Just a Scala version increment

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[pwendell]

Maybe this needs to touch project/plugins.sbt also?

[markhamstra]

My build didn't need that just to succeed, so I'm not sure what Jenkins problem is, but you're right that updating the plugins is a good idea.

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All automated tests passed.
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[AmplabJenkins]

Can one of the admins verify this patch?

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[markhamstra]

That should be all of them now, but there is a 2.10.3-specific comment in the root pom.xml that could use some investigation @srowen

     <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>jcl-over-slf4j</artifactId>
        <version>${slf4j.version}</version>
        <!-- <scope>runtime</scope> --> <!-- more correct, but scalac 2.10.3 doesn't like it -->
      </dependency>

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[mateiz]

Thanks Mark, merged this.