solve libpath issue (#187)

docs/FAQ.md

@@ -18,7 +18,7 @@ LightGBM FAQ
     setup.py directory, *never* absolute paths.
     ```
 
-- **Solution 1**: please check [this thread on stackoverflow](http://stackoverflow.com/questions/18085571/pip-install-error-setup-script-specifies-an-absolute-path).
+- **Solution 1**: this error should be solved in latest version. If you still meet this error, try to remove lightgbm.egg-info folder in your python-package and reinstall, or check [this thread on stackoverflow](http://stackoverflow.com/questions/18085571/pip-install-error-setup-script-specifies-an-absolute-path).
 
 - **Question 2**: I see error messages like `Cannot get/set label/weight/init_score/group/num_data/num_feature before construct dataset`, but I already contruct dataset by some code like `train = lightgbm.Dataset(X_train, y_train)`, or error messages like `Cannot set predictor/reference/categorical feature after freed raw data, set free_raw_data=False when construct Dataset to avoid this.`.
 

python-package/setup.py

@@ -16,7 +16,7 @@ libpath_py = os.path.join(CURRENT_DIR, 'lightgbm/libpath.py')
 libpath = {'__file__': libpath_py}
 exec(compile(open(libpath_py, "rb").read(), libpath_py, 'exec'), libpath, libpath)
 
-LIB_PATH = libpath['find_lib_path']()
+LIB_PATH = [os.path.relpath(path, CURRENT_DIR) for path in libpath['find_lib_path']()]
 print("Install lib_lightgbm from: %s" % LIB_PATH)