Changelog
*********

0.3 (2014-09-01)
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* `Activity.exchanges` now returns an instance of `Exchanges`, a proxy for a list of exchanges.
* All attributes can now be retrieved.
* Subclass from collections where possible.
* Make read-only more explicit.
* Load activity data only on demand.
* Don't copy exchange data.
* Add `Exchange.as_functional_unit`.

0.2.1 (2014-04-28)
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* Added link to Youtube video demonstrating the features of bw2simple.

0.2 (2014-04-27)
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* Fix LCIA score bug.

0.1 (2014-04-17)
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* Initial check-in. Create module structure.
