Transmogrify.webcrawler

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- only open cache files when needed so don't run out of handles [djay]
- follow http-equiv refresh links [djay]

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- files use file pointers to reduce memory usage [djay]
- cache saves .metadata files to record and playback headersx [djay]

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- improve logging [djay]
- fix encoding bug caused by cache [djay]

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- Fixed bug in cache that caused many links to be ignored in some cases [djay]
- Fix documentation up [djay]

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- Stopped localhost output when no output set [djay]

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- change site_url to just url. [djay]

- rename maxpage to maxsize [djay]

- fix file: style urls [djay]

- Added cache option to replace base_alias [djay]

- fix _origin key set by webcrawler, instead of url now it is path as expected by further blue
[Vitaliy Podoba]

- add _orig_path to pipeline item to keep original path for any further purposes, we will need
[Vitaliy Podoba]

- make all url absolute taking into account base tags inside webcrawler blueprint
[Vitaliy Podoba]