Raven

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* Add formatted attribute to message events
* Fill in empty filename if django fails to give one for
template information on newer Django versions with disabled
debug mode.

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* fixed an error that could cause certain SQL queries to fail to
record as breadcrumbs if no parameters were supplied.

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* remove duration from SQL query breadcrumbs. This was not rendered
in the UI and will come back in future versions of Sentry with a
different interface.
* resolved a bug that caused crumbs to be recorded incorrectly.

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* Breadcrumbs are now attempted to be deduplicated to catch some common
cases where log messages just spam up the breadcrumbs.
* Improvements to the public breadcrumbs API and stabilized some.
* Automatically activate the context on calls to `merge`

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* if breadcrumbs fail to process due to an error they are now skipped.

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* exc_info is no longer included in logger based breadcrumbs.
* log the entire logger name as category.
* added a `enable_breadcrumbs` flag to the client to allow the enabling or
disabling of breadcrumbs quickly.
* corrected an issue where python interpreters with bytecode writing enabled
would report incorrect logging locations when breadcrumb patching for
logging was enabled.