OOP (#10)

* Update wrapper.py

* Update exceptions.py

* Update __init__.py

* test adjusted for new changes

* Update wrapper.py

waybackpy/exceptions.py

@@ -1,43 +1,6 @@
 # -*- coding: utf-8 -*-
 
-class TooManyArchivingRequests(Exception):
-
-    """Error when a single url reqeusted for archiving too many times in a short timespam.
-    Wayback machine doesn't supports archivng any url too many times in a short period of time.
+class WaybackError(Exception):
     """
-
-class ArchivingNotAllowed(Exception):
-
-    """Files like robots.txt are set to deny robot archiving.
-    Wayback machine respects these file, will not archive.
-    """
-
-class PageNotSaved(Exception):
-    """
-    When unable to save a webpage.
-    """
-
-class ArchiveNotFound(Exception):
-    """
-    When a page was never archived but client asks for old archive.
-    """
-
-class UrlNotFound(Exception):
-    """
-    Raised when 404 UrlNotFound.
-    """
-
-class BadGateWay(Exception):
-    """
-    Raised when 502 bad gateway.
-    """
-
-class WaybackUnavailable(Exception):
-    """
-    Raised when 503 API Service Temporarily Unavailable.
-    """
-
-class InvalidUrl(Exception):
-    """
-    Raised when url doesn't follow the standard url format.
+    Raised when API Service error.
     """