Merge pull request #2 from civicrm/master

docs/api/index.md

docs/api/interfaces.md

docs/api/v3/actions.md

docs/api/v3/chaining.md

docs/api/v3/changes.md

docs/api/v3/custom-data.md

docs/api/v3/examples.md

docs/api/v3/joins.md

docs/api/v3/options.md

docs/api/v3/usage.md

docs/api/v4/actions.md

docs/api/v4/chaining.md

docs/api/v4/changes.md

docs/api/v4/custom-data.md

docs/api/v4/differences-with-v3.md

docs/api/v4/joins.md

docs/api/v4/usage.md

docs/core/pr-review.md

docs/extensions/civix.md

docs/extensions/lifecycle.md