Holmium-core

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* Lazy driver initialization. The webdriver is created
when the test first accesses it.
* Support for using multiple browsers (drivers) in test cases. The original
self.driver is still available along with a self.drivers list which lazily
initializes new drivers as they are accessed via index. drivers[0] == driver.
* New environment variable / nose option to force browser(s) to be shutdown and
restarted between tests. (it is disabled by default, but cookies are still
always cleared between tests)
* New assertions added to the TestCase base class
* Documentation cleanups
* Bug fixes for default timeout/only_if arugment for Element/Elements/ElementMap

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* PyPy support
* Allow customization of WebElements by exposing `ElementEnhancer`_

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* Re-added python 2.6 support

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* Python 3.3 now supported and tested.

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* New parameter **only_if** (callable that accepts the webelement that was
found) accepted by Element, Elements, ElementMap that allows for waiting
for an element to become valid according to the response of **only_if**. The callable will be checked uptil the timeout parameter set
on the Element.

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* Bug fix for config module being reused between test runs.