Unshortenit

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* Removed PyV8 requirement for adf.ly
* Added ay.gy domain for adf.ly regex
* Added sh.st support

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* Switched linkbucks.com to use selenium PhantomJS driver due to ongoing challenges with their site

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* Fixed linkbucks.com issues resulting from additional changes to their site

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* Fixed linkbucks.com issues resulting from additional changes to their site

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* Fixed adfoc.us issues resulting from changes to their site
* Fixed linkbucks.com issues resulting from changes to their site

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* Added support for p.ost.im.
* Fixed blocking issue with direct links to file downloads