Codechange: Fix Ply version check used by nmlc --version

- Change imports to only import __version__
- Change Pillow import to be similar to new fixed Ply import
- Fix Ply import not using __version__ from bundled Ply

Author: ingstem

nml/version_info.py

@@ -21,17 +21,17 @@ def get_lib_versions():
     versions = {}
     # PIL
     try:
-        import PIL
+        from PIL import __version__ as pil_version
 
-        versions["PIL"] = PIL.__version__
+        versions["PIL"] = pil_version
     except ImportError:
         versions["PIL"] = "Not found!"
 
     # PLY
     try:
-        from ply import lex
+        from .ply import __version__ as ply_version
 
-        versions["PLY"] = lex.__version__
+        versions["PLY"] = ply_version
     except ImportError:
         versions["PLY"] = "Not found!"