Render forms using crispy, ret rid of own renderer

Signed-off-by: Michal Čihař <michal@cihar.com>
Fixed rendering of project subscriptions

Signed-off-by: Michal Čihař <michal@cihar.com>
Add hint for using cached template loader

Signed-off-by: Michal Čihař <michal@cihar.com>
Merge branch 'master' into bootstrap