Fixing error 500 when using duplicated names for project points
Merge pull request #161 from taigaio/bug/points/error-when-using-duplicated-names-for-project

Fixing error 500 when using duplicated names for project points
Fixing update_roles when project point ? exists but is not null
Merge pull request #162 from taigaio/bug/1634/update-role-failing

Fixing update_roles when project point "?" exists but is not null
Disabling membership creation if the role isn't valid for the project
Merge pull request #163 from taigaio/bug/1628/creating-memberships-with-invalid-role

Disabling membership creation if the role isn't valid for the project
Small updates of the project templates api
Adding partial_update_perms to project api permissions
Fixed project_templates json fixture to include the slug
Fixing validation of email and role in memberships
Merge pull request #164 from taigaio/bug/1650/error-validating-email-and-role-in-memberships

Fixing validation of email and role in memberships
Adding history entries to sample data
Merge pull request #165 from taigaio/adding-history-entries-to-sample-data-command

Adding history entries to sample data
Remove alt attr in a link
Fix some tests
Adding member stats to the API
Adding leave project API
Add db_index to key field in history_entry
Refactoring owner permissions, now only is_owner memberships are considered as owner users
Refactoring the filtering by permissions with django-1.7 djorm-pgarray features