Rename namespace class to {package.name}Package

Conflicts:

	compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/JavaElementFinder.java

compiler/testData/checkLocalVariablesTable/_DefaultPackage$foo1$1.kt

@@ -0,0 +1,9 @@
+fun foo1() {
+    (1..5).forEach {
+        println(it)
+    }
+}
+
+// METHOD : invoke(I)V
+// VARIABLE : NAME=this TYPE=L_DefaultPackage$foo1$1; INDEX=0
+// VARIABLE : NAME=it TYPE=I INDEX=1