Refactor the code to make it comply with PEP-8 standards:Convert all class definitions to CamelCase style.

(issue 37)

src/component/package_manager/__init__.py

@@ -1,3 +1,3 @@
-from .env import pkg_env_mgr,pkg_env
-from .pkg import pkg_info,pkg_media_info
-from .installer import pkg_install_task
+from .env import PackageEnvManager,PackageEnv
+from .pkg import PackageInfo,PackageMediaInfo
+from .installer import PackageInstallTask