Plone-app-theming

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- Remove bundled twitter bootstrap theme 'example'.
Fixes https://github.com/plone/Products.CMFPlone/issues/877
[pbauer]

- Remove duplicate type attribute for theming control panel delete modal.
[esteele]

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- rewrite manifest from copied theme with relative paths also
[vangheem]

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- theme mapper fixes for odd behavior in save files at times
[swartz]

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- Build thememapper resources.
[vangheem]

- Added cache invalidation option.
[swartz]

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- change link from plone.org to plone.com.
[tkimnguyen]

- fix toolbar on control panel
[vangheem]

- fix less building
[obct537]

- Fixed copy modal for themes with a dot in the name.
[Gagaro]

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- Provide better styling to themeing control panel, less build, finish implementation
[obct537]

- make sure when copying themes that you try to modify the base urls
to match the new theme are all the manifest.cfg settings
[vangheem]

- implement switchable theming policy API, re-implement theme caching
[gyst]

- fixed configuration of copied theme
[vmaksymiv]

- implemented upload for theme manager
[schwartz]

- Change the category of the configlet to 'plone-general'.
[sneridagh]