Restructure specification sections.
Add spec-additions.rst with info on recaptcha and common event fields.
move matrix-generic content to new matrix-doc git project
move swagger JSON from synapse project to matrix-doc project
Merge branch 'docs-restructuring' of github.com:matrix-org/synapse into develop
Bump database version number.
Bump version and changelog
Bump syutil dependency
add log line for checking verifying signatures
More log lines.
Check that we have auth headers and fail nicely
Merge branch 'release-v0.4.0' of github.com:matrix-org/synapse into develop