Support eclipse 4.5. (mars release)

[adampauls]

I'm currently getting this exception:

java.util.NoSuchElementException: None.get
at scala.None$.get(Option.scala:313)
at scala.None$.get(Option.scala:311)
at org.scalastyle.scalastyleplugin.config.Persistence$.loadProject(ProjectConfiguration.scala:93)
at org.scalastyle.scalastyleplugin.builder.ScalastyleBuilder$$anonfun$handleBuildSelection$1.apply$mcV$sp(ScalastyleBuilder.scala:143)
at org.scalastyle.scalastyleplugin.ExceptionUtils$.handleException(ExceptionUtils.scala:54)
at org.scalastyle.scalastyleplugin.builder.ScalastyleBuilder.handleBuildSelection(ScalastyleBuilder.scala:137)
at org.scalastyle.scalastyleplugin.builder.ScalastyleBuilder.delegatedBuild(ScalastyleBuilder.scala:120)
at org.scalastyle.scalastyleplugin.builder.JavaScalastyleBuilder.build(JavaScalastyleBuilder.java:30)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:734)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:205)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:245)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:300)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:303)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:359)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:382)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

With this session data;

eclipse.buildId=4.5.2.M20160212-1500
java.version=1.8.0_31
java.vendor=Oracle Corporation
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product -product org.eclipse.epp.package.java.product -product org.eclipse.epp.package.java.product -keyring /Users/adpauls/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -product org.eclipse.epp.package.java.product -product org.eclipse.epp.package.java.product -data file:/Users/adpauls/sm/EclipseProjects/ -product org.eclipse.epp.package.java.product -keyring /Users/adpauls/.eclipse_keyring -showlocation