Implement System.getProperty as an interface to GWT properties.

This patch also renames some classes to be more consistently named.

Change-Id: If9df3458396892f416b5db2f6ca5b06ee15e1251
diff --git a/dev/BUILD b/dev/BUILD
index 3f95d37..996a4e1 100644
--- a/dev/BUILD
+++ b/dev/BUILD
@@ -175,7 +175,7 @@
             "core/src/com/google/gwt/dev/CompilerContext.java",
             "core/src/com/google/gwt/dev/CompileTaskOptions.java",
             "core/src/com/google/gwt/dev/CompileTaskOptionsImpl.java",
-            "core/src/com/google/gwt/dev/GwtCreateMap.java",
+            "core/src/com/google/gwt/dev/PropertyAndBindingInfo.java",
             "core/src/com/google/gwt/dev/GwtVersion.java",
             "core/src/com/google/gwt/dev/MinimalRebuildCache.java",
             "core/src/com/google/gwt/dev/NullRebuildCache.java",