Sss

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* Major change: the burndown chart is now powered by JQuery.flot library.
you are no longer forced to be connected to the web to see your
chart. Yay!
* Burndown chart optimisation. Much less queries to compute the graph,
we used to run a query per sprint day. Now we only run the "count"
query once, and reduce the result via Python. Isn't that nice towards
the DB servers?
* a few more parameters you may want to change (chart dimensions)
* minor bugfixes (requirements file, and rendering of an empty sprint).

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* Minor bugfixes (setup.py)
* Bugfix about the Burnown chart handling of start and end dates.

Warning! This version is not retro-compatible with 1.0. Your data
must be dumped via `dumpdata` before trying to upgrade (and then
reload it via `loaddata`)

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Initial 1.0 release.

Features:

* add, edit, remove Stories (tasks, backlog elements), with appropriate
values (story points and priority)
* assign them to the current sprint,
* eventually close them as you finish your task
* See a Burndown Chart (powered by Google Chart API)