New features:
- Added option for route defined with an attribute. Fixes #424.
- Added revisionable and translatable properties for content entity type base fields. Fixes #441.
Bug fixes:
- Fixed button form elements should use #value property instead of #title. Fixes #445.
- Updated README installation instructions.
Internal:
- Changed hook_menu-based router item generator to use version attributes.
- Added attributes test group.
- Changed function attribute property to add parameters as well as class.
- Changed detection of legacy hook implementation to use a property rather than check the attribute.
- Renamed Expression Language functions in the form 'fooFromBar'. Fixes #433.
- Added assertion for base field definition not having method calls.