Merge pull request #53 from robertatakenaka/master

Update of versionOverview.txt 5.28
Update sci_common.xsl

Incluindo pingdom script.
Update sci_common.xsl
Update classScielo.php
Update versionOverview.txt
Update scielo.def.php.template
Merge branch 'master' of git://github.com/scieloorg/Web into 54