add bootstrap.php for unit test
add FunctionsInterface
add Functions
add AliasLoader
fix comment
add FunctionsInterface::splAutoloadRegister()
add Functions::splAutoloadRegister()
add AliasLoader::register()
add AliasLoaderInterface
Add depend Pimple
make AliasLoader implements AliasLoaderInterface
Add AliasLoaderProvider
fix test classes's namespace
Merge branch 'hotfix/1_implement_alias_loader'