Fix "Error with time data"

Automatically and silently default to 1900 when an invalid date is encountered.
Resolves #70

Author: ILAsoft

exitwp.py

@@ -178,9 +178,9 @@ def gi(q, unicode_wrap=True, empty=False):
 
 def format_date(date_text,date_format):
     try:
-        datetime.strptime(date_text, date_format)
+        return datetime.strptime(date_text, date_format)
     except ValueError:
-        'None'
+        return datetime.strptime("1900-01-01 00:00:00", date_format)
 
 def write_jekyll(data, target_format):