OSMF SVN

Refactor to improve parsing performance of style properties, by caching styles reused throughout a SMPTE-TT document and using Singletons for default properties like NormalHeight, AutoOrigin, and AutoExtent.

Added more useful CaptionElement.toString() method.
Organized imports in CaptioningDocument and SMPTETTFactoryFacade

Updated SMPTETTParser.computeTimeIntervals method to use TimeCode.maxValue for the endTime if no media duration is specified.

Removed redundant call to TimeCode.parseFramerate() in TimeExpression.as
Added TimeCode.maxValue() method.
Updated TimeCode conversion functions to use Math.round rather than Math.floor when converting to ticksPcrTb which improves comparision accuracy.

Updated Flex project properties to compile targeting the latest Flex SDK and player version.

- changed failing rtmp live external asset. This fixes the nightly build.

[Ignore] Restore file samples/SMPTETTPlugin/src/org/osmf/smpte/tt/media/SMPTETTProxyElement.as

[Ignore] Removed corrupted file samples/SMPTETTPlugin/src/org/osmf/smpte/tt/media/SMPTETTProxyElement.as

Made it so that ParseEvents bubble up from SMPTETTLoadTrait through the SMPTETTProxyElement so that they can be used to display a progress indicator.

Refactored TimeCode to improve parsing and comparison performance.

Added SMPTETTProxyElement.hasDescendantMarkerEvents to test before attaching a timer event to listen for caption or animation changes within a given TimelineMetaEvent time span.