Support Point-in-time Data Operation (#343)

* add period ops class

* black format

* add pit data read

* fix bug in period ops

* update ops runnable

* update PIT test example

* black format

* update PIT test

* update tets_PIT

* update code format

* add check_feature_exist

* black format

* optimize the PIT Algorithm

* fix bug

* update example

* update test_PIT name

* add pit collector

* black format

* fix bugs

* fix try

* fix bug & add dump_pit.py

* Successfully run and understand PIT

* Add some docs and remove a bug

* mv crypto collector

* black format

* Run succesfully after merging master

* Pass test and fix code

* remove useless PIT code

* fix PYlint

* Rename

Co-authored-by: Young <afe.young@gmail.com>

setup.py

@@ -126,6 +126,14 @@ setup(
     },
     ext_modules=extensions,
     install_requires=REQUIRED,
+    extras_require={
+        "dev": [
+            "coverage",
+            "pytest>=3",
+            "sphinx",
+            "sphinx_rtd_theme",
+        ]
+    },
     include_package_data=True,
     classifiers=[
         # Trove classifiers