1.0.0-beta5

• integrated puli/asset-plugin into puli/manager
• added ConfigManager interface
• added argument $raw to the getters in ConfigManager
• added PuliEvents::PRE_BUILD_REPOSITORY and PuliEvents::POST_BUILD_REPOSITORY
• added PackageManager::renamePackage()
• removed default servers
• renamed AssetMapping::getPublicPath() to getServerPath()
• renamed InstallationParams::getPublicPath() to getServerPath()
• upgraded to webmozart/path-util 2.0
• fixed PackageFileInstallerManager for unloadable packages
• decoupled from puli/factory
• fixed filemtime() warning when no puli.json is present in the current directory
• removed realpath() where it doesn't work if the package is distributed in a
  PHAR