base implementation of nested IMicroblogContext (thx @buchi!)
switch on the nested context logic by default
fix checking logic for corner case
start adding object_context to StatusUpdate
Add Brazilian Portuguese translation
Fix Brazilian Portuguese translation
Fix package distribution

- Add classifiers
- Add dependencies
- Rename documentation to .rst to reflect reStructuredText formatting
- Fix license version number to GPLv2 as stated on included LICENSE.GPL file
- Add MANIFEST.in file
Use bootstrap.py from 1.x branch and upgrade zc.buildout to 1.7.1
Remove needless dependencies on zope.app.component and zope.app.container
Set package development status classifier as Alpha
stamp release
Preparing release 0.5.3
Add more basic installation/uninstallation tests

- Use plone.api on tests
- Replace deprecated aliases
- Add tests for add-on layer
- Add tests for CSS registry
- Add tests for permissions
- Update package dependencies
Flake8
merge master