Plone.resourceeditor

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Fixes:

- No longer rely on deprecated ``bobobase_modification_time`` from
``Persistence.Persistent``.
[thet]

- Minor cleanup: pep8, readability, ReST.
[jensens]

- Fixed problem causing file timestamps to show up incorrectly.
[obct537]

- Fixed error preventing file saving in the filemanager.
[obct537]

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- handle NotFound errors while generating file/folder listings
[vangheem]

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- Added check to prevent overwriting folders when saving
[obct537]

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- Added ability to convert absolute to relative urls
[obct537]

- Fixed issue with ascii encoding
[obct537]

- now properly serves filesystem files to the thememapper
[obct537]

- resourceeditor will now register non-standard mimetypes in the python
mimetype module
[obct537]

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- move to mockup based file manager. Plone 5 only here.
[vangheem]

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- make sure theme is disable
[vangheem]

- do not set value inside of pre tag since it can go crazy on some markup
[vangheem]