Added actions for load and unload of extensions
Added extensionapi:configure command
Added exist method to ExtensionApiService
Fixed bug in install/uninstall extension
Fixed merge conflict
Fixed bug in configureExtension service method
Added clearing of cache after loading / unloading / configuring extension
Added additional code for extensionapi:configure
Fixed bug in extensionapi:configure
Added stubs for fetch and import
Added fetch and import stubs to extensionapi service
Added extra validation of arguments for configure command
Added code for extensionapi:import
Additional code for extensionapi:import
Added check for required extension in extensionapi:uninstall
Added a first version of extensionapi:fetch
Added php doc for param --version in method fetchCommand
Added validation for mirror
Changed signature of ExtensionApiCommandController::configureCommand
Fixed bug in ExtensionApiService::unInstallExtension