Prepare for pushing version 0.4.2.

ChangeLog

+2008-10-30: Version 0.4.2
+
+        Improved performance of Array.prototype.concat by moving the
+        implementation to C++ (issue 123).
+
+        Fixed heap growth policy to avoid growing old space to its maximum
+        capacity before doing a garbage collection and fixed issue that
+        would lead to artificial out of memory situations (issue 129).
+
+        Fixed Date.prototype.toLocaleDateString to return the date in the
+        same format as WebKit.
+
+        Added missing initialization checks to debugger API.
+
+        Added removing of unused maps during GC.
+
+
 2008-10-28: Version 0.4.1
 
         Added caching of RegExp data in compilation cache.
 
         Added Visual Studio project file for d8 shell.
 
         Fixed function call performance regression introduced in version
         0.4.0 when splitting the global object in two parts (issue 120).
 
         Fixed issue 131 by checking for empty handles before throwing and
@@ skipping 396 matching lines @@
 
         Improved debugger support by allowing nested break points and by
         dealing with stack-overflows when compiling functions before
         setting break points in them.
 
 
 2008-07-03: Version 0.1.0
 
         Initial export.