Merge pull request #20 from titusfortner/master

Support for Validating with Nokogiri
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Getting rid of the #present? check.

Selenium::WebDriver::Element#find_element already throws an error if a requested element can not be found. But it throws a very informative ElementNotFound error, whereas this #raise was throwing a useless RuntimeError for the exact same situation.

Several methods make assumptions around ElementNotFoundErrors. For example Wait#until assumes (correctly) that users want errors raised from an element not being found to be ignored. When using GenericElements in a wait block, however, a user would have to tell Wait#until to ignore StandardErrors as well, because this #present? check was essentially masking ElementNotFoundErrors as RuntimeErrors.
Merge pull request #21 from chrismikehogan/master

Getting rid of the #present? check.
Fixing the specs.
Merge pull request #22 from chrismikehogan/master

Fixing the specs.
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