Plonesocial.microblog

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* Portlets can work on Plone4 and on Plone5
* URL preview test do not fetch remote resources to avoid timeout
[ale-rt]

* merge "Conversation" sprint reply-to-statusupdate

* "Berlin" sprint frontend rewrite based on patternslib

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* use UID from brain Don't do getobject
[maartenkling]

* add url preview tool that adapts StatusUpdate and returns list of image links
[amleczko]

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* Package distribution was fixed by adding classifiers, dependencies and
fixing license version number as GPLv2; a MANIFEST.in file was also added.
[hvelarde]

* Brazilian Portuguese translation was added.
[hvelarde]

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* bump version after having pypi release confusion [gyst]
* use backwardly compatible accessor [gyst]
* trust context=None defaults [gyst]
* French translation [tdesvenain]
* Few fixes on microblog context when we are in subfolders of context [tdesvenain]

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* update docs [gyst]
* finish IMicroblogContext implementation [gyst]
* provide upgrade step to add uuid mapping on older installed microblog tool [gyst]
* implement IMicroblogContext acquisition and storage for StatusUpdate [gyst, tdesvenain]
* Simplify API to filter on either user or context, but not on both. Cleanup and restructure implementation [gyst]
* fix testing thread cleanup [gyst]
* reword IMicroblogContext behavior [gyst]
* add a behaviour for IMicroblogContext local microblog support interface [tdesvenain]
* define IMicroblogContext interface as integration hook for local workspaces [gyst]
* fix flake8 errors [gyst]
* implement and integrate context permission checks for local microblog spaces [gyst]
* context filtering by uuid [gyst]
* integration test with actual plone.app.uuid resolving [gyst]
* refactor to (mocked) plone.app.uuid integration [gyst]
* base implementation for context-aware statuscontainer [gyst]

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* Plone 4.3 compatiblity [tdesvenain]