Add SqliteError exception.

The original scraperwiki API provided a SqliteError exception.  This
add the exception definition to allow the old scripts to keep working.

Author: petterreinholdtsen

scraperwiki/sql.py

@@ -19,6 +19,11 @@
 SECONDS_BETWEEN_COMMIT = 2
 unicode = type(u'')
 
+# The scraperwiki.sqlite.SqliteError exception
+class SqliteError(Exception):
+    """Problem with SQLite."""
+    pass
+
 class Blob(bytes):
 
     """