Fairly major performance regression from v2.2.0-v2.2.2

I was doing some hotshot[1] based profiling tonight with some of 
the basic performances tests I had written once upon a time and I
noticed that while Template.compile() has remained speedy,
Template.__init__() has gotten horrifically slow in comparision.
.
Upon further digging and prodding I found the issue was one that I
introduced in 8982ecd
.
The PATCH follows this email includes the fix, insofar that it
causes the dir() call to only execute at module import instead of
__init__() (relevant members of Template really aren't likely
to change between instantiations of Template).


I'm considering backmerging this down into master/maint and
creating a v2.2.2.1 with the performance regression fixed, thoughts?

Cheers,
-R. Tyler Ballance
.
[1] http://docs.python.org/library/hotshot.html

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