Add doc strings (#90)

* Added some docstrings in utils.py

* renamed some func/meth to better names and added doc strings + lint

* added more docstrings

* more docstrings

* improve docstrings

* docstrings

* added more docstrings, lint

* fix import error

waybackpy/snapshot.py

@@ -3,15 +3,24 @@ from datetime import datetime
 
 class CdxSnapshot:
     """
-    This class helps to use the Cdx Snapshots easily.
+    This class encapsulates the snapshots for greater usability.
 
     Raw Snapshot data looks like:
     org,archive)/ 20080126045828 http://github.com text/html 200 Q4YULN754FHV2U6Q5JUT6Q2P57WEWNNY 1415
 
-    properties is a dict containg all of the 7 cdx snapshot properties.
     """
 
     def __init__(self, properties):
+        """
+        Parameters
+        ----------
+        self : waybackpy.snapshot.CdxSnapshot
+            The instance itself
+
+        properties : dict
+            Properties is a dict containg all of the 7 cdx snapshot properties.
+
+        """
         self.urlkey = properties["urlkey"]
         self.timestamp = properties["timestamp"]
         self.datetime_timestamp = datetime.strptime(self.timestamp, "%Y%m%d%H%M%S")
@@ -25,6 +34,12 @@ class CdxSnapshot:
         )
 
     def __str__(self):
+        """Returns the Cdx snapshot line.
+
+        Output format:
+        org,archive)/ 20080126045828 http://github.com text/html 200 Q4YULN754FHV2U6Q5JUT6Q2P57WEWNNY 1415
+
+        """
         return "{urlkey} {timestamp} {original} {mimetype} {statuscode} {digest} {length}".format(
             urlkey=self.urlkey,
             timestamp=self.timestamp,