v0.7

• "src/Testing" excluded from testing & test coverage.
• CSS tweaks.
• News/pages support (via NewsSource) - ready for blogging.
• Collapse blocks are scrolled into view on opening.
• Text editor fixes.
• No logging is done if the log file name is empty.
• Minor Linker changes.
• Validation error produces 400 response instead of 500.
• EventDispatcher revamp (callables).
• API access modes: full, read, read_one.
• Bug fix in user validation.
• Test dummies reorganized.
• Event system tests.
• Twig translator extension - ready for UI localization.
• Angular modal improvements.
• disqus_url falls back to canonical_url.