fix pep8 on admin article
./opps/article/admin.py:41:44: E231 missing whitespace after ','
./opps/article/admin.py:53:61: W291 trailing whitespace

Fix pull request #29 @algmelo
Upgrade django wysiwyg redactor to 0.3.1
fix https://github.com/douglasmiranda/django-wysiwyg-redactor/pull/1
Remove white space on editor redactor
Add @gilsondev on commmit member
Fix channel admin.