Updated copyright year, enabled linking to PHP core elements and disabled integration of source code.
Updated copyright year.
Fixed comments.
Fixed comments.
Update.

- Added dependencies.
- Updated description.
- Added directories to the autoloader path.
Updated dependencies.
Overhaul of the enumeration implementation.

- Modified the declaration of functional enumerations.
- Updated detection of enumeration constants to "final public static"
methods with a uppercase name. This allows "final public static methods"
in enumeration types now.
- Fixed problems with the inheritance of enumeration types. Additional
enumeration constants in subclasses are have the type of the superclass
now.
- Made constructor and static utility methods in class EnumAbstract
"final" to disallow the modification of the implementation.
- Added dependencies to other packages to remove code duplication:
- Replaced hash code calculation with fw/HashCode.
- Updated class EnumAbstract to a real Multiton with fw/Singleton.
- Made enumeration constants immutable with fw/Immutable.
- Enhanced unit tests.
- Fixes in the documentation."
Updated functional enumeration example.
Deleted unnecessary mock classes.
Prepared version 0.4.0-stable.