people_block: fix cache expiration of members_block

fixes #11
container_block: fix the use of container blocks with templates

fixes #7
Merge branch 'I11-fix_members_block_cache' into 'master'

Fix members block cache

Fixes issue #11

See merge request !326
Merge branch 'I7-fix_template_with_container_block' into 'master'

Fix template with container block

Fixes issue #7

See merge request !327