Big memory usage improvements

[Menno Smits]

Christian (babbageclunk) has been busy fixing various memory leaks in the
Juju controllers and has made some significant improvements. Chris
(veebers) has been tracking resource usage for a long running test which
adds and removes a bunch of models and he noticed the difference.

Take a look at the memory usage graphs here:

Before: http://people.canonical.com/~leecj2/perfscalemem/
After: http://people.canonical.com/~leecj2/perfscalemem2/

Interestingly the MongoDB memory usage profile is quite different as well.
I'm not sure if this is due to Christian's improvements or something else.

There's possibly still some more small leaks somewhere but this is
fantastic regardless. Thanks to Christian for tackling this and Chris for
tracking the numbers.

- Menno
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