Collective.addthis

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- Nothing changed yet.

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- latest plone compatiblity [kiorky, hvelarde]
- Travis CI [kiorky]
- Better release infra [kiorky]

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- Fix when work offline [toutpt]
- Refactor SocialMediaSources to work with plone.app.registry and not
fecthing them over http on each rendering. [toutpt, pingviini]

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- Fixed javascript bug.

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- Added configuration option to hide AddThis button.
- Fixed bug where addthis broke javascripts when watching content
without IBelowContentBody provider.
- Fixed styles to not display border-bottom for link (from Sunbursts
public.css).
- Added hints where to place css & js resources in registry so that
they get merged with majority of plones own resources.

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- Add Italian translation [giacomos]
- Added spanish translation [Manuel, Acento Web, S.L.]
- Uses plone.app.registry for settings [pingviini]
- Added data_track_callback option [pingviini]
- Added tests [pingviini]
- Add french translation. [toutpt]
- Add collective.googleanalytics integration following
http://www.addthis.com/help/google-analytics-integration.To83N5zOifZ
[toutpt]
- Add data_track_addressbar option
[toutpt]