Add a scala gitignore

This is a work in progress for scala integration, as parts are still
missing.

conf/gitignore/Scala

@@ -0,0 +1,28 @@
+# Scala
+*.class
+*.log
+
+# SBT specific
+.cache/
+.history/
+.lib/
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+
+# Scala-IDE specific
+.scala_dependencies
+.worksheet
+
+# IntelliJ specifics
+*.iml
+*.ipr
+*.iws
+.idea
+out
+
+# Apple addicts
+.DS_Store