Unbreak WebDriverAlertTest
Cleanup WebDriver, WebElement, and Alert targetting
Fixup comments
AlertTarget is not necessary or useful
Remove unused import
Unit tests catch dumb mistakes
More unit tests + bug fixes
Prevent currentTarget from ever being null
Update Javadoc
Implement hashCode and require non nulls in WebDriverTargets
Add more tests for CachingTargetLocator
Remove unused import
Add another few unit tests for CachingtargetLocator
Merge pull request #32 from darcy-framework/targetting-cleanup

Cleanup WebDriver, WebElement, and Alert targetting
Wrap alert interactions in try/catch (fixes #30)
Add tests for parentFrame() target