Remove duplicated --schema option for tenant_command
Allow to store template in a subdirectory of a tenant directory

For example use MULTITENANT_TEMPLATE_DIRS =
('/var/lib/tenants/%s/templates/',) instead of just
('/var/lib/tenants/templates/',).
PEP8 and typos
Merge pull request #172 from rev112/pep8_and_typos

PEP8 and typos
Merge pull request #165 from rev112/fix_duplicated_tenant_schema

Remove duplicated --schema option for tenant_command
Added third party apps section to dos
Merge pull request #167 from bdauvergne/wip/improve-template-loader-path

Allow to store templates in a subdirectory of a tenant directory