Timing Spec Updates

Per Last Call feedback, I have made the following spec updates. Please review these changes.

Resource Timing - http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/ResourceTiming/Overview.html

*         ACTION-100: Updated processing model to take care of case when onresourcetimingbufferfull callback isn't defined

*         Updated initiatorType definition

*         Updated the Timing-Allow-Origin processing model

*         Updated references to the 'Timing-Allow-Origin HTTP response header rules' to the 'timing allow check algorithm'

*         Added an about:blank example

*         Fixed typo in spec: "include resource in the PerformanceResourceTiming interface" should be "include resource as a PerformanceResourceTiming object in the Performance Timeline"

User Timing - http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/UserTiming/Overview.html

*         ACTION-103: Updated the return type of getMarks and getMeasures from Array to object and defined the object to be a dictionary

*         Updated the User Timing example

*         Added a privacy and security section

Performance Timeline - http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PerformanceTimeline/Overview.html

*         Fixed a typo in the example

*         Fixed a typo in a definition

Page Visibility - http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html

*         Fixed the issue where pagehide and pageshow are defined to be fired in the wrong order

Navigation Timing 2 - http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming2/Overview.html

*         Fixed a typo in the definition

Thanks,
Jatinder