Totally refactored source files location

Now it *should* be easier to turn Telethon
into a pip package

telethon_tests/__init__.py

@@ -0,0 +1,5 @@
+from .crypto_tests import CryptoTests
+from .network_tests import NetworkTests
+from .parser_tests import ParserTests
+from .tl_tests import TLTests
+from .utils_tests import UtilsTests