fixes #1479 - sendHttpRequest() can throw exception, so we must try...catch;...

fixes #1479 - sendHttpRequest() can throw exception, so we must try...catch; also fix the formatting to conform to style guidelines; update third-party licensing doc

git-svn-id: http://dev.piwik.org/svn/trunk@2507 59fd770c-687e-43c8-a1e3-f5a4ff64c105