OSMF SVN

Fix for FM-1257 ( http://bugs.adobe.com/jira/browse/FM-1257 )
- make sure that httpMetadata aexists before adding values to it
- append alternative media only if the resource is a HTTP Streaming resource

Integrating back from layout branch ( kimi-llnw)
- fix for FM-1181 ( Custom Chrome Plugin: UI elements appear out of order )
- fix for FM-1166 ( Scale mode bug with parallel elements )
- automatic index for children of a parallel element
- moving index attribute in a separate class ( OverlayLayoutMetadata)
- adding OVERLAY LayoutMode
- updating units tests
- updating sample applications

[lba] Updating unit tests to use local player objects and not class wide one.

Updated the LayoutSample6.as application, due the fact that modifying index now triggers the refreshing of the display layout.

Integrating latest changes from main trunk.

[lba] Making "Late-binding audio on HDS" related APIs private
- fixing autoSwitch unit tests for HTTPStreamingSwitchManager

[lba] Update HTTPNetStream to work without alternative sources
- fix bug FM-1254 ( http://bugs.adobe.com/jira/browse/FM-1254 - ALternate tracks with type different from audio lead to an RTE in F4M loader)

small updates to HelloWorld9.as

Modifying HelloWorld9.as to support new http streaming usecases

Manifests tests, updated again