[Radiant] Extension initialization code reloads on each request in dev mode

[Casper Fabricius]

Radiant 0.6.7 seems to call the activate method of each extension upon  
each request when in development mode. Perhaps it has always been so,  
but it gets very visible and quite annoying when extensions use the  
"shards/facets" feature. Here is an example of a clean 0.6.7 with the  
reorder extension for 0.6.7 installed, where a couple of pages has  
been visited in development mode:

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This unwanted behaviour goes away in production mode, so it must be  
related to Rails reloading all files on each request in development  
mode. How do I avoid that the activate method is called upon each  
request in development mode - or - how do I avoid that it "caches"  
previously added fragments/shards?

Cheers,
Casper Fabricius