Merge branch 'release/alpha-0.2' into develop
Add specific classes for each Mailin attribute type.
Provide a class to help filtering on attributes.
Update the test suite.
Modify all class names to improve lisibility.
Add a new class FilterCriterium to allow more advanced filters on attributes.
Finish tests related to DELETE-ATTRIBUTES service, since the related issue has been fixed.
Add somr new tests on user operations.
Fix some bugs and add new methods.
Handle the "listid_unlink" parameter for user save operation.
Add an extra helper in the Log class to get the last operation response data.
Add methods to Mailin\Log and fix a bug wih API::getFolders (wrong separator).
Update the API::getLists method.
Update the README file with release info and version.
Merge branch 'release/1.0'