Fix wikilink extension: use absolute urls
If two pending memberships exist in the same projecto I can't delete them
Fix notification of objects without permissions
Merge pull request #173 from taigaio/fix/notifications

Fix notification of objects without permissions
Merge pull request #172 from taigaio/bug/1700/delete-empty-memberships

If two pending memberships exist in the same projecto I can't delete them
Merge pull request #170 from taigaio/bug/1668/fix-wiki-links-in-markdown

Fix wikilink extension: use absolute urls
@ikame :sailboat:
WIP
Now tests of status change working
WORKING
Small refactor