1.0.0-alpha2

• removed PathMatcher; its logic was moved to "webmozart/path-util"
• moved RepositoryLoader, OverrideConflictException and
  ResourceDefinitionException to "puli/repository-manager"
• moved code to Puli\Extension\Composer namespace
• added ComposerPlugin for Puli

1.0.0-alpha1

Released version 1.0.0-alpha1