Log integration polishing

[hannelita]

Acceptance

• Handle large log entries (prevent timeouts)
• Handle proper encoding
• Integration test (log consumption)

Tasks

• Set up a max page size to prevent timeouts (this issue won't implement full pagination, but at least the request won't fail when fetching the logs)
• Encode JSON response before calling response.json() on aircan-connector

Analysis

PR datopian/ckanext-aircan#21 was merged and it breaks the filter

Notes

These two features are left out
dynamic filters
Customizable filters

[hannelita]

See #93 - An integration test would have caught the problem

[hannelita]

Blocked by #93