Cognitive services python face samples (#20)

* added working samples for common and detection

* edited common and detection parameters and completed find_similar sample

* edited find_similar sample and added group sample

* added identify sample

* added samples for verify

* finished samples and edited retrieval method of environment variables

* cleaned up samples, getting rid of unused imports and variables

* consolidated the face samples into a single python file face_samples.py

* edited commenting in face samples

* got rid of change I accidentally made to text analytics samples

* changed samples.tools import to tools import

* edited face samples based on requests and added image_analysis_in_stream back as a sample

* properly added .idea/ to gitignore

* fixed with requested changes

* replaced samples.tools with tools

* streamlined python code

* edited python face samples, still need to check on return type

* edited face samples and fixed errors

Author: iscai-msft

.gitignore

@@ -99,3 +99,10 @@ ENV/
 
 # mypy
 .mypy_cache/
+
+# idea files
+.idea/
+
+#DS store
+.DS_Store
+samples/DS_Store