Update REPL code to use our own version of JLineReader, which fixes #89.

I'm not entirely sure why this broke in the jump from Scala 2.9.0.1 to
2.9.1 -- maybe something about name resolution changed?

repl/src/main/scala/spark/repl/SparkILoop.scala

@@ -802,13 +802,13 @@ class SparkILoop(in0: Option[BufferedReader], val out: PrintWriter, val master:
   def chooseReader(settings: Settings): InteractiveReader = {
     if (settings.Xnojline.value || Properties.isEmacsShell)
       SimpleReader()
-    else try JLineReader(
+    else try SparkJLineReader(
       if (settings.noCompletion.value) NoCompletion
-      else new JLineCompletion(intp)
+      else new SparkJLineCompletion(intp)
     )
     catch {
       case ex @ (_: Exception | _: NoClassDefFoundError) =>
-        echo("Failed to created JLineReader: " + ex + "\nFalling back to SimpleReader.")
+        echo("Failed to created SparkJLineReader: " + ex + "\nFalling back to SimpleReader.")
         SimpleReader()
     }
   }
@@ -985,7 +985,7 @@ object SparkILoop {
     repl.settings = new Settings(echo)
     repl.settings.embeddedDefaults[T]
     repl.createInterpreter()
-    repl.in = JLineReader(repl)
+    repl.in = SparkJLineReader(repl)
     
     // rebind exit so people don't accidentally call sys.exit by way of predef
     repl.quietRun("""def exit = println("Type :quit to resume program execution.")""")

repl/src/main/scala/spark/repl/SparkJLineCompletion.scala

@@ -15,7 +15,7 @@ import collection.mutable.ListBuffer
 
 // REPL completor - queries supplied interpreter for valid
 // completions based on current contents of buffer.
-class JLineCompletion(val intp: SparkIMain) extends Completion with CompletionOutput {
+class SparkJLineCompletion(val intp: SparkIMain) extends Completion with CompletionOutput {
   val global: intp.global.type = intp.global
   import global._
   import definitions.{ PredefModule, RootClass, AnyClass, AnyRefClass, ScalaPackage, JavaLangPackage }

repl/src/main/scala/spark/repl/SparkJLineReader.scala

@@ -73,7 +73,7 @@ class SparkJLineReader(val completion: Completion) extends InteractiveReader {
   def readOneKey(prompt: String)  = consoleReader readOneKey prompt
 }
 
-object JLineReader {
-  def apply(intp: SparkIMain): JLineReader = apply(new JLineCompletion(intp))
-  def apply(comp: Completion): JLineReader = new JLineReader(comp)
+object SparkJLineReader {
+  def apply(intp: SparkIMain): SparkJLineReader = apply(new SparkJLineCompletion(intp))
+  def apply(comp: Completion): SparkJLineReader = new SparkJLineReader(comp)
 }