01/20/2010
 * Added 'Check Frequency' and 'More Keywords' settings. Now you can specify
 up to 10 keywords. Specifying more than 5 keywords with frequency 'daily'
 will gives you a warning.

09/13/2010
 * Added 'Notify email receipients' text area to the settings form. With this,
 report email can be sent to specified email addresses.
 * Modified regex pattern for google.com so that it matches new google search
 results.

09/14/2010
 * Settings page is moved from the Report section to the Site Configuraiton section.
 * Added permission only to view ranking report page.
 * Added email report by role to the settings form. Deleted 'notify to admin'
 checkbox.

09/15/2010
 * Added update script seowatcher_update_6101() to seowatcher.install

09/20/2010
 * Removed BING.COM from the target providers since it's exactly same as YAHOO.COM

10/30/2010
 * Porting to D7
 * Converted 'datetime' fields in schema to 'int' (UNIX timestamp) since D7 schema API droped the support of 'datatime' field type.
 * Now menu path for configure is 'amin/config/seowatcher'.

11/24/2010
 * #981171 by realworksmedia - changed file_get_contents() to drupal_http_request().

07/13/2013
 * Modified code to make it work with current search engines.

07/22/2013
 * Made search engines to be used selectable at the configuration page.
 * Changed the package to none to "SEO" and configuration URL from
   /admin/config/seowatcher to /admin/config/search/seowatcher