Don't include pretty print if it's already there .
include jquery - we're no longer bundling.
Only complile references to MVC if it's #define'd in (ASP_NET_MVC3).
Move the MVC specific ClientTimingHelper code to it's own #defined partial
Merge branch 'master' into optional-prettyprint
Fix a bug with Extjs file uploads. They use an iframe and fake an xhr so there's no headers.
Test for existance the right way.
Merge pull request #172 from joshrobb/break-mvc-dependency

Break mvc dependency