Stxnext-staticdeployment

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- Code refactoring
- Compatibility with Plone 3
- Created tests
- Added possibility of generating relative paths

History of earlier changes: https://github.com/stxnext/stxnext.staticdeployment/blob/refactoring/docs/OLD_HISTORY.txt

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- fixed applying image transformations for resources images [radekj]

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- image transformations extended with possibility to change image filename [radekj]

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- added possibility for registration of image transformations [radekj]

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- added 'jpeg' as valid extension of image file [radekj]

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- fixed dumping images [radekj]