User:Legoktm/composer notes

Need from composer

 * Composer\Package\LinkConstraint
 * VersionConstraint
 * SpecificConstraint
 * LinkConstraintInterface
 * MultiConstraint
 * EmptyConstraint (not directly used)


 * Composer\Package\Version\VersionParser
 * parseConstraints - BasePackage::$stabilities
 * parseConstraint - BasePackage::$stabilities
 * parseLinks - returns Link's
 * formatVersion - uses PackageInterface