Conflicting cross-version suffixes in Dispatch dependencies

[earldouglas]

On startup, sbt explodes with the following:

[error] Modules were resolved with conflicting cross-version suffixes in {file:/home/james/code/scalatra-sbt/project/}scalatra-sbt-build:
[error]    net.databinder:dispatch-core _2.9.1, _2.10
[error]    net.databinder:dispatch-http _2.9.1, _2.10
[error]    net.databinder:dispatch-futures _2.9.1, _2.10
java.lang.RuntimeException: Conflicting cross-version suffixes in: net.databinder:dispatch-core, net.databinder:dispatch-http, net.databinder:dispatch-futures
        at scala.sys.package$.error(package.scala:27)
        at sbt.ConflictWarning$.processCrossVersioned(ConflictWarning.scala:46)
        at sbt.ConflictWarning$.apply(ConflictWarning.scala:32)
        at sbt.Classpaths$$anonfun$66.apply(Defaults.scala:1164)
        at sbt.Classpaths$$anonfun$66.apply(Defaults.scala:1161)
        at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
        at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
        at sbt.std.Transform$$anon$4.work(System.scala:63)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
        at sbt.Execute.work(Execute.scala:235)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
        at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
        at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
[error] (*:update) Conflicting cross-version suffixes in: net.databinder:dispatch-core, net.databinder:dispatch-http, net.databinder:dispatch-futures

This appears to be caused by sbt-pgp:

• ls-sbt on sbt 0.13 pulls dispatch _2.9.1 and _2.10 softprops/ls#71 (comment)
• Error with sbt - Modules were resolved with conflicting cross-version suffixes playframework/play-slick#228 (comment)