Revert #153 "temporarily remove integrate-ide as a part of integrate-main"

This reverts commit 46b6aa1.

at scala/scala-dev#71 , @sschaef says
the coast should be clear now

Author: SethTisue

templates/default/jobs/scala/validate/main.xml.erb

@@ -34,7 +34,10 @@ buildVersionProps.load(new java.io.FileInputStream(upstreamPropsArtifact.file))
 
 testParams = params + [ "scalaVersion" : buildVersionProps["maven.version.number"] ]
 
-build(testParams, "#{job("validate/test")}")
+parallel (
+   { build(testParams, "#{job("validate/test")}") },
+   { retry(2, { build(testParams, "#{job("integrate/ide")}") }) }
+)
 
 EOX
 ) %>