A '#' character in the URL causes database error

While the field stores both the full path and the video-id, it does not sufficiently process the video-id portion of certain URLs, which results in a DB error.

For example, the URL: http://www.youtube.com/watch?v=1SqBdS0XkV4#1234, results in a video-id of 1SqBdS0XkV4#1234, which exceeds the 15 characters allowed in the `video_id` DB field.

Expected results:

Long Video ID values are either rejected as invalid, or trimmed with a warning.

Actual results:

A DB error, as follows.

PDOException: SQLSTATE[22001]: String data, right truncated: 1406 
Data too long for column 'field_youtube_video_video_id' at row 1: 
INSERT INTO {field_data_field_youtube_video} 
	(entity_type, entity_id, revision_id, bundle, delta, language, field_youtube_video_input, field_youtube_video_video_id) 
	VALUES 
	(:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7); 
Array ( 
	[:db_insert_placeholder_0] => node 
	[:db_insert_placeholder_1] => 36 
	[:db_insert_placeholder_2] => 151 
	[:db_insert_placeholder_3] => testimonial 
	[:db_insert_placeholder_4] => 0 
	[:db_insert_placeholder_5] => und 
	[:db_insert_placeholder_6] => http://www.youtube.com/watch?v=1SqBdS0XkV4#1234 
	[:db_insert_placeholder_7] => 1SqBdS0XkV4#1234 
) 
in field_sql_storage_field_storage_write() (line 451 of .../field/modules/field_sql_storage/field_sql_storage.module).