Dock fps panel to top of stage area. HiDPI support.
Create less objects and reduce recursion in the quad tree.
Optimize quad tree visualization.
Speed up invalidation for SWFs with lots of moving content.
Merge pull request #668 from tobeytailor/quadtree

Quad tree related performance and memory consumption optimizations
Fix E4X x.@* refeferences
Handle the case of null namespaces in accessor api
Merge pull request #669 from artcompiler/e4x

Fix E4X x.@* references
only include mouse visitor in fps display when frame is rendered
use performance.now() for time measurement
makes fps panel behave exactly like scout, optimizations, some refactoring, etc
Merge pull request #667 from claus/inspector

Inspector: FPS panel improvements
Changes `make server` to add no-cache headers to all responses

Required to force Firefox to update SWF files loaded via XMLHTTPRequest
Merge pull request #671 from tschneidereit/webserver

Changes `make server` to add no-cache headers to all responses
Converts all internal coordinates to Twips
Merge pull request #673 from tschneidereit/master

Converts all internal coordinates to Twips
Add more info to DisplayListTree entry details view
Merge pull request #674 from tschneidereit/master

Add more info to DisplayListTree entry details view
Slight math optimizations
Merge pull request #675 from tschneidereit/master

Slight math optimizations