OSMF SVN

[LBA] Fix FM-1266 bug (http://bugs.adobe.com/jira/browse/FM-1266)
- when LightVideoElement was unloaded ( through processUnloadingState), the ALTERNATIVE_AUDIO trait was not properly removed.

HelloWorld9.as committed for bug reproduction

[LBA] Bug fixes
- Fix http://bugs.adobe.com/jira/browse/FM-1267 ( the alterative streams names replaced the multibitreate stream names when onNotifyRates was called )
- Fix http://bugs.adobe.com/jira/browse/FM-1268 ( the mbr transition was consider also an alternative stream change )

OSMF 1.6 sprint 3 tag.

[LBA] Fix RTE on Live when bootstrap infor is null
- removed unneeded trace messages
- verify that bootstrap information is not null before using it

[LBA] Fix RTE on seeking when using legacy content.

[LBA] Additional fix for FM-1263 (http://bugs.adobe.com/jira/browse/FM-1263)
- reset internal playhead used for audio video mixing
- reflect current playhead in sample application

[LBA] Partial fix for FM-1263 (http://bugs.adobe.com/jira/browse/FM-1263)

[LBA] Partial fix for seeking-related bugs around late-binding
- fix for FM-1251 ( http://bugs.adobe.com/jira/browse/FM-1251 )

[LBA] Bug fix for FM-1260 ( http://bugs.adobe.com/jira/browse/FM-1260 )
- NetStreamAlternativeAudioTrait didn't listen for TRANSITION_COMPLETE event from HttpNetStream to signal the end of stream change.