CRM-12280 fixes to civicrm.css to prevent force compatibility mode in IE9

----------------------------------------
* CRM-12280: "Compatibility mode" forced in IE9 (Joomla version)
  http://issues.civicrm.org/jira/browse/CRM-12280
Merge pull request #327 from davecivicrm/CRM-12280

CRM-12280 fixes to civicrm.css to prevent force compatibility mode in IE...