Update base platform to SR1 RC2 for Juno contribution.
Update base platform of target build to SR1 RC2 for Juno.

Using 4.2-M-builds/M20120829-1200/ from the Eclipse Platform team.
Support "redirect" field in json message meta object

See Bug 388249 - Handle HTTP redirect in Ajax response
Recompile client.js
Backport the fix for bug 387099 to 1.5 maintenance branch 

387099: [Text] Modify listener is not notified when content is cut
(Ctrl+X) in IE9
https://bugs.eclipse.org/bugs/show_bug.cgi?id=387099
Backport the fix for bug 383447

383447: [ScrolledComposite][List] Mousewheel scrolling broken in firefox
13
https://bugs.eclipse.org/bugs/show_bug.cgi?id=383447
Backport the fix for bug 384589

384589: [CellEditor] Wrong row is edited when last row is visible
https://bugs.eclipse.org/bugs/show_bug.cgi?id=384589
Backport the fix for bug 388950

388950: Virtual tree viewer contains wrong items after refresh
https://bugs.eclipse.org/bugs/show_bug.cgi?id=388950
Backport the fix for bug 389020

389020: Transparent Composite background color in default theme
https://bugs.eclipse.org/bugs/show_bug.cgi?id=389020
Backport the fix for bug 378752

378752: Missing ToolItem and ToolItems Not Correctly Sized
https://bugs.eclipse.org/bugs/show_bug.cgi?id=378752
Update p2 repository locations (Juno SR1 RC3) to M20120905-2300
Remove startup parameters

389399: Remove startup parameter in 1.5 launch configs
https://bugs.eclipse.org/bugs/show_bug.cgi?id=389399
Update p2 repository locations (Juno SR1 RC4) to M20120914-1800
Provide initial XSL script that adds p2 stats to the artifact repo.

382874: Add download stats and mirrors URL to p2 metadata
https://bugs.eclipse.org/bugs/show_bug.cgi?id=382874
Fix theming for List items with custom variant

Bug 394079 - [Theming][List] Custom variant styling for lines in List do
not work correctly
Use main 4.2 Eclipse Platform p2 repository for target build.
Prepare for Juno SR2 (RAP 1.5.2)

- Update pom.xml, feature.xml, MANIFEST.MF, category.xml to 
  version 1.5.2
- Adjust copyright information (headers, features) to 2013
- Adjust build scripts to Eclipse Platform 4.2.2 RC1
Include javax.xml in org.eclipse.rap.runtime.requirements feature
Backport bug 397840 to 1.5-maintenance branch

397840: Tabfolder not resizing in IE9
https://bugs.eclipse.org/bugs/show_bug.cgi?id=397840
Backport bug 391081 to 1.5-maintenance branch

391081: Context menu allows change of selection
https://bugs.eclipse.org/bugs/show_bug.cgi?id=391081