2.12 support

[skyluc]

Rebased #20 on top of #23 and the 0.1.6-SNAPSHOT branch.

[huitseeker]

@skyluc are you sure you want to keep #23 open then ?
@daniel-trinh Don't hesitate to ask again for help on this one.

[daniel-trinh]

It looks like the org.scalariform references should be updated to com.danieltrinh --

Also, it looks like the 2.11 scala version is still pointing to 2.11-SNAPSHOT:

      <properties>
        <scala.version>2.11.0-SNAPSHOT</scala.version>
        <version.suffix>2_11</version.suffix>
      </properties>

Should that be fixed as part of this merge request?

After I tried making these modifications locally, running mvn -Pscala-2.12.x clean verify -e passed, although I got this warning, not sure if it is relevant:

[WARNING]  Expected all dependencies to require Scala version: 2.12.0-SNAPSHOT
[WARNING]  com.danieltrinh:scalariform.feature:0.1.6-SNAPSHOT requires scala version: 2.12.0-SNAPSHOT
[WARNING]  org.scala-lang.modules:scala-xml_2.11:1.0.2 requires scala version: 2.11.1
[WARNING] Multiple versions of scala libraries detected!

[skyluc]

@huitseeker #23 is just a straight-forward fix to align the version numbers

@daniel-trinh the groupId and the version numbers are already fixed in the 0.1.6-SNAPSHOT branch (the branch this pull request is based on). I see more changes needed on these points.

For the warning, not much can be done about it. scala-xml will always depend on a fixed version of Scala, which will different to the -SNAPSHOT version. Right now 2.11-1.0.2 is compatible with Scala 2.12. The Scala team will generate a new version if it breaks.

[daniel-trinh]

I will eventually update the SBT build at some point for 2.12, but that can be done separately from the maven builds for eclipse.